That is an excellent question. Is it acceptable in the industry. One of the basic ideas behind the HF training was that it got people together in a room where issues could be honestly and openly discussed. It gave you an opportunity to learn about potential and existing issues from your peers.
If you do this training on line then you won't get that element. The chances are that all you get is something that bores you with slides, or info, on human performance and limitations without relating it to what you do in a meaningful way.
Personally I'm a great believer in getting people together and having an opportunity to say what I really believe about HF. There are some serious issues and a lot of training doesn't address it.
Cheap and ticks the box, nothing learnt but what the hell.
Rant over, if it is acceptable to tick the box and industry is happy with it then who can fault you. Especially if it is cheap, that is what people seem to want nowadays.