Sheikh Hamdan bin Mohammed bin Rashid Al Maktoum's dad was apparently interested in buying the club in 2008 but was put off by the £480m asking price. Even though they're vastly wealthy, they'll not be willing to just pay anything to get the deal done.
Not indicating any of the above is true, but the Dubai royal family have clearly been looking to buy a premier league club for a while, and have reportedly been interested in us in the past.
iirc he was put off by Ashley and his arsehole ways, don't think price was the issue.
Another thing to add, the names on that list don't strike me as the kind of people that would share things, they'd want it all. Whoever sent that text just googled a few rich people from the middle east and cobbled them together without much thought.