Totally understood, Kirsten. Both you and I offered suggestion to remedy that, and that was approved by FHC for this region: write the correct term on the Addendum with clarifying statement. If an eviction would ensue based on the word "pet", the landlord already recognized the cats as ESA, and the person followed procedures in re: requesting RA for keeping her cats, it most likely not have merit and probably be dismissed.
Her landlord has accepted the Dr letter of need for ESA. The harrasment could be considered retaliatory. This might best be handled through Fair Housing, or private attorney.
My lived experience and professional experience/training/employment with this type of situation differs. I would think that any more comments made would require actual reading of the document in question. If the landlord is ignorant, but acting in good faith, changing the letters from PET to ESA should not be a problem. If it is a problem, the person may need legal guidance on resolving the problem.
I also suggested the person contact their FHC for the most accurate directives on how to handle the situation.
I understand what you are getting at, however.