As I mentioned a while back, they'll be extremely glad that the roadmap means there's potential for a lot of social distancing restriction to be lifted so early. I'd almost certainly assume that they expected restrictions similar to last season to be in place for the vast majority of the summer, hence the planning to have the flats come in for the season.
If they can get through the first 2-3 months of opening, weather permitting they're likely banking on the second half of the season being a corker for them. More rides available, and hopefully some decent events announced building on the changes last year - really looking forward to it!