Honestly not sure... but I think it's still west coast offense, at least as much as moderation day offenses are still (none of them are pure west coast offenses anymore)
Bill Walsh passed it to George Seifert
George Seifert passed it to Mike Holmgren, Mike Shanahan, and Marc Trestman.
Holmgren of course had Jon Gruden and MM under him, while Shanahan has Gary Kubiak.
The Packers are just used to Holmgren's coaching line of it, but I believe Shanahan's passing attack was still west coast offense style, as the running attack style changed to an outside zone (which even MM converted his rushing attack to zone as well with Jeff Jagodzinski, who learned it from the Falcons, who knew it because Dan Reeves was there before him).
But it's said that LaFleur learned a lot from Kyle Shanahan and Sean McVay. Both of which joined the NFL under Jon Gruden and then worked under Mike Shanahan. The big different being Kyle got a lot more Gary Kubiak, while Sean got a lot more Jay Gruden. But all of these coaches are West Coast Offense Coaches.
I THINK this is a pretty good summery of the different offenses around the NFL last year.
San Francisco 49ers
Coach Kyle Shanahan has continued to evolve his father Mike’s blend of West Coast passing concepts with a zone running game. While the West Coast offense is based on short passes, Shanahan also creates plenty of explosive plays down the field. He is willing to spread out the defense from traditional run-heavy personnel groups to create problems for the defense.
Los Angeles Rams
Sean McVay’s offense is a mix of things he learned from both Jon and Jay Gruden, combined with concepts from his time spent under Mike and Kyle Shanahan. All of those schemes are rooted in the West Coast offense, but McVay's is far more explosive than a typical West Coast scheme, as he uses shorter passes to set up deeper shots later on. He also uses plenty of misdirection -- handoffs, end-arounds, bubble screens -- to try to catch the defense out of position.
Since LaFleur is new, he was guessing on him a bit.
New offensive coordinator Matt LaFleur was on Mike Shanahan’s 2012 Redskins staff when Robert Griffin III excelled as a mobile quarterback, so he should be a perfect fit for Marcus Mariota, who is a good runner and very accurate on the shorter throws found in West Coast schemes. Look for LaFleur to blend read-option packages with a zone running game and play-action passing attack.