Other articles are also stating the permanence of this threat. He explicitly stated "potentially closing the building permanently." Not until the end of restrictions, not until the virus has passed. Permanently. As in forever.

https://www.jpost.com/diaspora/nyc-mayor-to-synagogues-close-for-coronavirus-or-be-shut-down-permanently-622767

https://www.dailywire.com/news/bill-de-blasio-threatens-to-permanently-close-nyc-churches-if-they-dont-comply-with-social-distancing

I understand the social distancing part, but this is just a power grab and a blatant erasure of the first amendment.