Yes, it’s true. I don’t know what ‘official data’ you have access to but it’s widespread knowledge that they’re heavily invested in the UK economy. The BBC even touched on this recently:
https://www.bbc.co.uk/news/business-63715388.amp
I’m not saying it’s okay, I’m saying they’re already here so turn your gas off, move out of your apartment, close your bank account if you’re really troubled by the Qatari investments in the UK, surely football comes last in all those priorities for what’s important in life.
And before anyone gets upset about their involvement, the UK economy wouldn’t grow without outside foreign investment. The British public don’t invest or save enough to grow the economy so the money has to come from somewhere.