That’s interesting.Nah at the door they told me that. They never even looked at my passport, just said they're not doing the extensions. Habilitación de salida was available at migraciones though you can also do it at the airports
In June this year Migraciones stopped issuing automatic monthly visa extensions for lockdown stranded foreigners, on the ground that immigration offices are again fully operational.
However, these offices won’t issue any visa extensions. I gather from your experience that immigration has suspended the issuing of visa extensions, possibly as long as the restrictions last.