It's not likely a cut-dry case of aim a few propane heaters at the wheel bogeys and hope for the best, but probably something closer to those rides you referred to had modifications such as different wheels for cold weather, maybe different lubrications (neither are super noticable), etc that were designed for the ride and accounted for before the park started blasting the heat. I'd have to guess that they probably had lower minimums than the BGW rides to begin with as well.
All that to say that I'm not saying BGW couldn't work with their rides manufacturers to lower the minimum recommended run temperatures (doubt they'd risk operating below recommendations), but they'd likely do a cost/benefit study or few before attempting. Keeping in mind, of course, that rides aren't their only core strength and they're only now dipping into year-round operations in the middle of a pandemic so their focus may be on other things for awhile.
All that to say that I'm not saying BGW couldn't work with their rides manufacturers to lower the minimum recommended run temperatures (doubt they'd risk operating below recommendations), but they'd likely do a cost/benefit study or few before attempting. Keeping in mind, of course, that rides aren't their only core strength and they're only now dipping into year-round operations in the middle of a pandemic so their focus may be on other things for awhile.