They got TSNed.
We see this phenomenon a lot when it comes to Torontonians and their local hockey club, the Maple Leafs. TSN, Sportsnet, and the local and national sports media goes on and on and on about how great the team is, routinely overestimating the prowess of the team and its players. This creates lofty, often unreasonable, expectations for the team from their fans.
TSN has been beating the same drum for so long regarding a certain quarterback, it’s not surprising you observed some Lions fans exhibiting symptoms of TSNitis.
As such, I’ve also already seen some suggesting they’re heavy favourites for next year’s Grey Cup, and that it is pretty likely they’ll be looking for back-to-back championships on home field in the 2024 Grey Cup.