Sadly, if the hogs come back, they may take a little while before they felt safe enough. Also, if any that survived found a new home which they liked, why would they come back, until/unless the population increased and they spread out a bit again. I imagine it varies a bit from place to place and different circumstances, etc. But it may be a bit of a waiting game. But you might find that when the hoglets begin to disperse a bit, and particularly after hibernation next year, you might have some luck.
Meanwhile try to link as many gardens as possible so that hogs have a comparatively safe route to get around to enough suitable habitat. I think I saw elsewhere that you had a constant source of water, although I hope it isn’t too deep for hoglets.
Good luck hopefully some hogs will appear – as long as that badger stays away.