Late to the party to comment...
To put this into perspective (and think about this one...)
How many people do you know that bought an Xbox One?
How many people do you know that bought and Xbox 360?
How many people do you know that bought a Playstation 3?
How many people do you know that have a Playstation 5?
WotC claims it has more fans of D&D than those numbers.
To clarify, WotC is making no such claims. I wish I could find the quote, but Phil Spencer of Microsoft has had estimated the size of the console industry as A) 200-300 million consoles, and B) essentially static between generations.
If you grab the sales data off Wikipedia, the rough estimate of Xbox 360 + PS3 sales are ~190 million. Xbox One + PS4 sales are ~180 million, and still in progress. Xbox Series + PS5 sales are less than 100 million, and not projected to substantially succeed the previous generation. Throw in some fudge factors to account for Nintendo consoles and people that own multiple consoles.
WotC is claiming 85 million fans of D&D, which as other people have pointed out is based on a definition of people playing (potential buyers), not PHB purchases. So by that metric, the size of the D&D market (and likely extendable to the TTRPG market) is smaller than the console gaming market according to WotC's projections, let alone PHB sales to unit console sales.
The news here isn't that D&D is bigger or smaller than consoles. Both Sony and Microsoft have indicated that there are structural problems in the console industry: the market is not growing fast enough to sustain the increased time of development and cost of AAA games.
Meanwhile, D&D 5E has had exponential growth compared to previous editions, and WotC is claiming 3x growth on the 2024 PHB, indicating that growth hasn't stalled on the latest revision. The story here is that the TTRPG market is probably healthy and growing.