Reviewing the logs I noticed the following errors listed:
Jan 01, 2020 11:13:15.094 [15072] ERROR - SQLITE3:0xa6086fb6, 11, database corruption at line 66053 of [bf8c1b2b7a]
Jan 01, 2020 11:13:15.094 [15072] ERROR - SQLITE3:0xa6086fb6, 11, database disk image is malformed in "PRAGMA cache_size=2000"
I would recommend first trying to fix the database corruption by following the instructions in the Repair a Corrupt Database Support Article.
After the database corruption is repaired you could check to see if the tuner is listed in the media_provider_resources table in your database by using a SQLite Database Browser Tool. If the tuner is listed you could try deleting it to see if Plex will detect the tuner again.
Of course all of the above should only be done while Plex Media Server is shutdown to ensure Plex is not trying to write to the database,
