No, gspawn-win64-helper.exe and gspawn-win64-helper-console.exe seem to be missing from the script.
Fixed via https://github.com/geany/geany/pull/4088.
Possibly not needed at all because these probably cause the extra console window with the server and if I manage to get it running with the Geany's spawn module, they won't be necessary either.
Windows is so much a hassle, at least with Geany's tech stack and probably not worth the efforts to get the LSP integration running. Or someone actually using it need to provide the necessary code changes.
I wanted to give it a try and followed https://wiki.geany.org/howtos/win32/msys2 to build geany and geany-plugins which I managed to do. However, when I start Geany using `/c/geany/bin/geany.exe`, no plugins are loaded (even not those bundled with geany itself). I also tried to set "extra plugin path" within Geany to the directory containing them but that didn't help. Any hints?