Since 2020 Fender has been owned by Servco Pacific, a Hawaiian car dealer that has some musical instrument holdings as well (Roland). It has a private equity arm attached from which presumably this idea came.
I wonder if someone up high in Honolulu has decided it's time to start the value extraction phase or prepare for a sale. It doesn't make much sense otherwise: this is a very brand destructive move in a market that's moved entirely by emotion. For sure they know this. Doing it secures their ownership over a bigger piece of IP than they previously had a fair claim to - not just the Stratocaster name, but the shape too. That might the brand more valuable in a sale.
From my cursory search, it just looks like they have a stock ownership position in Roland, not any real say in how Roland is ran. Kinda like how Game Stop has a position with eBay.
Not a lawyer and I don't have any insights to this, but I wouldn't speculate based off this - trademark holders kind of "have to" pursue each violation, because otherwise they carry the risk of the trademark becoming too widely used/generic so it would become meaningless.