The point is that they got that HoF QB while being average for years and not tanking. So, it is possible to get elite players, even elite QBs without tanking and they aren't the only team to have done it.
Philly did all those things without taking. And they did a lot more than trades with the Saints to build that team. They are great at scouting college and other NFL players. And they did it all without every tanking and remaining mediocre in between.
And there are other teams that have done the same. Green Bay has never tanked. At least not since before Favre was their QB.
Hell, the Patriots Dynasty was built without ever tanking and it followed years of being an average team.
Even Baltimore has never tanked and yet they have a franchise QB and would probably have rings if not for playing in the conference with the Bills and Chiefs.