Not sure I agree with that. Listening to the podcast, one of the bigger things I took from it was that Jared himself didn't believe he was far enough along to be able to accomplish as much as McVay envisioned for him. I'm referring to his quote that the NFL doesn't give young QB's enough time to grow into the position anymore.
Jared had a fantastic 2018 season with the highlight being the MNF game against KC. He looked like the real deal but still had some growing to do as evidenced by the Detroit and Chicago games and against New England in the Super Bowl. Those games, IMO, also showed the growth that was needed from McVay.
To put that loss on any one player or coach is a mistake.
I would think McVay was all for signing off on the new contract, but then realized Goff wasn't as far along as he thought. With a short (relatively speaking) SB window with Donald and Kupp, he needed a veteran that could lead them to a Super Bowl win.
Goff had some unbelievable games for the Rams while he was here, is a good dude and has matured a ton from his experiences. I always liked him but could also see the reason for the trade.
McVay and Snead are all about Super Bowls as they should be. To aim for anything less has no place at the NFL level. But to get there is a process that takes time unless you are able and willing to to make sacrifices (big contracts, draft picks, etc.) along the way. Goff was one of those sacrifices both in drafting him and trading him away.
Hope he has a great finish to his career and the snap judgements people are prone to fade with time and success.