Upvote:3
I think it is referring to whether an interview is required or waived.
https://mx.usembassy.gov/status-of-u-s-consular-operations-in-mexico-in-light-of-covid-19/
The U.S. Embassy and Consulates in Mexico are currently processing nonimmigrant visas. Applicants should expect a longer-than-normal wait time for this service and plan accordingly. For more information about wait times, visit this link . Applicants applying in the same visa class and whose previous visa expired within the last 48 months may be eligible for interview waiver. Applicants may schedule a renewal appointment here .
Upvote:5
I found a few different statements about interview waivers.
Burma's embassy has a comprehensive page about the different categories and what documents, etc. that you still have to have or submit. The Indian embassy has a slightly different statement about which visa categories are eligible.
And here's the Canadian one.