The guest who is a doctor incidentally, felt "threatened".   

Look at the letter this landlord sent to his tenants.Landlord Threatens Cutting Cable, Quick Evictions for Late Rent

All it would take are a few Yelp (or other ratings sites) mentioning that you kicked them out (or threatened to) during the COVID-19 epidemic. 

I can only threaten an eviction when things come back to normalcy and I dont see that happening anytime soon.

And now this crisis comes along possibly threatening my success with this one.

(see page 531)Basically, all residential rental property falls into this category.Here is what is said,The lessor of a covered dwelling may not make, or cause to be made, any filing with the court of jurisdiction to initiate a legal action to recover possession of the covered dwelling from the tenant regardless of cause, except when a tenant perpetrates a serious criminal act that threatens the health, life, or safety of other tenants, owners, or staff of the property in which the covered dwelling is located.

He threatened to take me to court but didn’t know the law so I showed him a copy along with his no renewal letter and that was that. 

@Pablo Martinez  Hire you own lawyer and threaten to sue her for harassment.   

Everything was great for 3 months; then the building was threatened with fines of $100,000 per day by the city.  

Plaintiff law firms are providing letter templates for tenants to use to threaten landlords.