Dropbox appointments in current COVID-19 situation

My employer is trying to book dropbox appointment and it shows as greyed out until June. First available slot shows as 2nd of June and the next available is on 30th of June. Rest all are greyed out.

Does it mean slots are not opened due to COVID-19 situation and will be updated in the coming future?

It is possible that Dropbox appointments have been blocked due to Coronavirus closures.

Officially, US embassy has only cancelled personal interview appointments.