The problem is that there seems to be no decision on whether they are buyers or sellers. You trade prospects during the offseason for Diaz/Cano. That would indicate that you are in "win now mode". For the last month you're in sell mode as you're actively looking to move Syndergaard, Wheeler and Diaz. Then you turn around and grab Stroman for prospects. Then you flip Vargas. Taken in a vacuum all these moves make sense. But they're not in a vacuum. One leads to another and you've got a team flipping back and forth between selling and buying. THEN you've got players and coaches going after reporters, you've already fired one of your coaches and your manager is probably out at the end of the year. Now maybe I'm reading too much into it but there definitely doesn't seem to be a current strategy to make the Mets organization better. As someone posted earlier, another exec has compared their organizational strategy to "a kindergarten student finger painting". You can disagree with that characterization if you want, but I feel pretty comfortable with stating that I'm not sure they have a plan.
Also don't know why you brought the buxton thing up. I've never mentioned it.
The Mets were buyers last offseason, and are still buyers for 2020 and beyond, but have become sellers for 2019 as they have fallen out of the race. Every move they have made is perfectly consistent with that. Buyer/seller doesn't have to be a static, binary thing.
Keep in mind they're not "actively shopping" Syndergaard with any kind of urgency -- they are looking for an elite return on him (i.e. Mackenzie Gore, or Lewis/Kirilloff), which again makes sense given their position.
Sorry for mentioning the Buxton thing, but a lot of posters seem to be using that as a cue to bash the Mets FO right now.