No, if the code compiles then it should be free of errors in the Intellisense. Try restarting VSCode regenerating the Intellisense yet again (Ctrl+Shift+P → Rebuild Intellisense).
I had done that a few times before your recommendations. Just did it again and now it seems to be working without error. Not sure exactly what did the trick. Everything seems to be in order now, thanks for the help!
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The issue of these was buttons was resolved in Prevent users from using wrong build / debug buttons · Issue #3229 · platformio/platformio-vscode-ide · GitHub.