Next time forget ROTO and call a Licensed plumber as NO ONE knows more about drains then the folks who install them.
Ok Most codes consider a fixture like a water closet (Toilet) an access point to the drainage/sewer system.
Removing the toilet gives the plumber access to a 4″ diameter pipe ( min is 3″)
Once the line is snaked and or jetted then the toilet can be reset NO BIG DEAL. The roto guys just dont have the proper training or the common sense.
This reminds me of the brain dead “Jack” who went to every home center he could locate to get information from stock clerks on rebuilding his getto apartment .
The advice was wrong BUT he certainly did get what he paid for.