Report

It will be a mess you're right. Best thing at this stage would be to report the situation:

In the desktop version open the map at the desired location
Click the hamburger icon ☰
Click Send feedback
Click Other feedback
Describe your issue or share your ideas
Add a screenshot as directed

Post on Local Connect and tag Morater

https://www.localguidesconnect.com/t5/General-Discussion/How-to-report-restore-a-hijacked-place-of-interest-international/m-p/3547416#M1326498

https://www.localguidesconnect.com/t5/General-Discussion/Hijacked-famous-POI/m-p/1915443#M552969

https://www.localguidesconnect.com/t5/General-Discussion/I-need-Google-input-on-a-Maps-entry-that-s-been-quot-hijacked/m-p/2334365#M774774