Hold back for how long? The hazards were on, I would take that to mean they had stopped for a while, knew that they shouldn't be stopped there so had put the hazards on because that makes it OK to illegally park!
At least a few seconds. Given their position of half on, half off a pavement and blocking an entrance, and that they only just arrived in that position suggests that despite the hazards they are likely to move again and probably forward. Even bad drivers don't tend to stay in a position quite that poor for any length of time.
It is a real pet peeve of mine when drivers park illegally and think that putting hazards on solves all. Drives me mad. The favourite of course is the stopping on double yellows made so much better by having two wheels on the pavement and hazards on.
Back on point though it is true that far too many older people make some horrible diving decisions and have zero awareness of what is outside of their tunnel view of the road. Almost every fatal accident in my area since I have been cycling is by an older driver, many of which should not be on the road as they have no spatial awareness. Relying on an older driver to make a shoulder check when they have already shown that they are a bad driver is akin to relying on a lottery win to pay your bills. It might happen but I wouldn't count on it.