There was a waiver for course providers to finish day 2 and 3 of courses online for ones already started and of course the trainer has already seen these people in person and seen their ID. It may be that DVSA sanction new courses running online, but if this is only a temporary situation I cannot see them devoting too much time to consider this.
There are problems to resuming courses in person for a while. Where will they be held? Hotels are shut, as are community centres and church halls that we use. Some of the venues are quite small so with 2 metres social distancing you might only get 4-5 people in the room, with the trainer as well.
When choosing a venue to run a course, we look at public transport availability, but much of this is not running, or on a very limited service. There is no point in offering a course that entitles a person to a reduction if they are a HRO but cannot get a medical because the doctors are not doing them, or issuing a certificate entitling them to a reduction if the court are on very limited manpower and may not process it, nor DVLA add it to a driver record for the same reason.
i suspect that when courses are allowed again, providers will have to prioritise offenders coming towards the end of the time allowed to give them a chance at benefitting from the reduction, rather than newly disqualified people who can wait for a while.
So the course providers are just one cog where the whole gearbox needs to be functional for the reduction in bans to be able to happen.