C'mon, dude. With the caveat that the value of an asset is different than a salary, it's nowhere near comparable.
This article says that the average NFL salary in 1984 was $162,000 including pro-rated signing bonuses. Just considering inflation (and nothing else)- that works out to $431K in 2021 dollars.
According to this article, the average salary today is $2.8M, representing ~6.5X increase over inflation.
With that said, that number is greatly skewed by mega-contracts in the NFL- in 1984 the biggest contract was Warren Moon's $6M over 5 years (AAV of $1.2M). Today it's Patrick Mahomes $45M/year- this is up 14X over inflation.
This skew shows up in the difference in median salaries-
this article says that the median salary was $130K in 1984 ($346K in 2021 dollars), whereas it's $860K today, meaning a 2.5X increase over inflation.
So- NFL players have increased their salaries somewhere between 2.5X and 14X over inflation.
$78M in 1984 dollars is $207M in today's dollars. If that $4B valuation is correct, it's a 19X increase over inflation. Even the highest-compensated players, who have reaped a disproportionate benefit from salary increases since 1984, have not done nearly as well as the owners