I think this is coming from a "plugins enshittify projects" mentality where the assumptions are:

• code bases should be as succinct and stable as possible.
• plugins add large amounts of unused code and obfuscate many granular aspects of program execution, increasing debug and research time.

Seems that the author views that the above devs chose to use plugins instead of writing their own code and shot themselves in the foot by doing so. The final portion seems to suggest that the person pushing all these changes then bobs out before any of the problems caused by these changes actually get solved.