I think you're confusing two different things.
Work permits are still being issued at the border for those with approved visas. I believe this is what the OP is asking about.
Work permit applications are not being accepted or processed at the border at this time. Visa exempt individuals used to be able to submit work permit applications at the border (vs. applying in advance). These services have been put on hold temporarily (per IRCC web site) due to COVID-19.