FYI qqqqqqqqqqqqqqqqqqqq - it should be possible to do partial revert with https://revert.monicz.dev/

First check with overpass what is the scope of this: https://overpass-turbo.eu/?Q=way[highway%3Dtertiary_link](user%3ATTK_liikuvus)%3B%0Aout+geom%3B&R&C

In the Changesets section you can add multiple values. There should be a least 10 changesets: 157659403,157661485,157663381,157663731,157664102,157665791,157666324,157667788,157668009,157668206

and in the Overpass filter add: way[highway=tertiary_link]

After the revert check the original Overpass query again.