Judging by the return the Brewers got, I assume that both Taylor and Houser were probably on the negative end of the tender/non-tender discussion. The Mets stepped in and offered a marginally-valued nugget, and saved the Brewers the need to have to inform two of the longest tenured players on the MLB roster that their services were no longer going to be required. I've always been a Houser fan, so this one hurts. He was the last one standing from that incredible 2015 deal that netted Josh Hader, among other contributors.
I think, if anything, this trade signals a commitment to youth. Churio/Mitchell/Frelick/Weimer ... Ashby/Gasser. I think they signed Joe Ross to basically serve Houser's role, at probably a higher upside and fraction of the cost.
I think it's important to remember that it's only Dec. 21. The 2024 Opening Day roster is far from set. This is typically the kind of move that starts a domino effect of more substantial moves.