Well that's because they signed their contracts years ago and Mahomes signed a 10 year deal. At the time of signing Allen was taking up more of the salary cap as a percentage than everyone and only Burrow has surpassed him since. I'm expecting Allen to want a new contract soon.
This is also just listing the yearly value of the contracts without taking into account how much was fully guaranteed and not the cap hits this year. A quick check tells me that Tua is $39M, Lamar is $43M, Hurts is only $21M, Lawrence is only $17M, Murray is $43M, Allen is $44M, Burrow $46M, and Mahomes is $66M. Dak is a mental $89M
Basically it's a garbage tweet.
edit: Checked the replies and someone had already done the work for me.