They have had MRI testing in the u-17 tournaments since 2008 or so and since then Nigeria has won both the 2013 and 2015 u-17 titles. In fact, I believe they are tested before both the African and World level events so that players like Wilfried Ndidi who passed once can still be barred from competing. Maybe your hypothesis is that the NFF, which recently was unable to find funds to fly the players to the Olympics or provide match balls for a senior-level international, is using new age technological advances to defeat these measures, I don't know.
Fwiw, they have also have had plenty of success at u-20, Olympic, and senior level since the mid-90's, with good players worldwide. This is not Sri Lanka winning youth tournaments.
Well success in U-20 can be achieved using age cheating too. There is a clear and obvious disparity between the dominance of Nigerian U17 sides and the failures of the senior side in comparison. Now, maybe the 2013 and 2015 winning sides are going to lead onto a new golden generation for the Super Eagles. However I'd argue that what is more likely is that the vast majority of the players will disappear off the face of the earth and Nigeria will continue the recent joy of failing to qualify for the 2015 and 2017 major international tournaments.
http://www.eurosport.com/football/nigerian-u17-team-wiped-out-as-all-but-two-players-fail-age-test_sto5707677/story.shtml
Failures for 2015 and 2017 are irrelevant when compared with a victory in 2013 and consistent success in the tournaments previous to this. Nigeria has underachieved of course, but they have been at five of the past six World Cups and to the second round thrice, so the idea that they are a disaster at world level is laughable. Our players also do quite well abroad. Nigerian football is extractive (no serious local league or infrastructure) and corrupt and will probably fail until this not the case, but what does that have to do with Kelechi Iheanacho? He is clearly the age he states, and you are talking rubbish. Fwiw, the boys from 2013 are already doing quite well abroad, probably better than their Mexican or Swiss counterparts before them.
All of this may be true, but again you're ignoring the point that Nigeria goes from being THE dominant force in world football at youth level - to being a top 30/40 team at full international level. There is quite clearly something amiss there, more than simply a lack of infrastructure and solid local league. What's to say Iheanacho is the age he's saying he is? I bet a google search would return a load of Nigerian bloggers speculating that he's older. Simply can't take anything for granted considering track record.
He has passed several scientific third party tests proving as much. Adam Armstrong hasn't passed a single one, so it is my position to now foolish speculate that he was born in Brunei in the year 1976. I have a better case than you do for Iheanacho. Most teams just cannot deal with the physicality of our players at youth level. This is why 2013 excited me much more than 2015, Kelechi's side played great football, 2015 just ran past and pushed through less physical sides. Nigeria is still one of the fastest and strongest at senior level, but more is required there and we lack often lack the technique and more crucially organisation of the top tier sides, in addition to the issues previously stated. This is just my opinion though, anyone with knowledge on the matter can form their own.