The stock Hellcat air filter is a flat panel paper filter. They are one use only, yes.
both 2019 Hellcat / Redeye use the CAI / cone element similar to what Demon models use.
I downloaded the 2019 owners manual and the SRT Owners Manual
- no mention of the Hellcat 2019 style filters.
However - there's two different procedures (pp 354 - 356 in the '19 manual)
Shaker filters - wash with detergent solution, rinse, air dry and NO oiling
T/A filters - recommended to use Mopar spray on filter cleaner, (once wire mesh is no longer visible), rinse with water, air dry (repeat clean and rinse if necessary) and then APPLY OIL
so there's two different means to the blue filters used on Shaker & T/A models
PS: spark plug intervals are 60K on Hellcat engines (vs. the 100K on all the others). I suppose this is due to the higher temperatures under boost that affect plug service life.
I suppose the answer might be if there's instructions with replacement Hellcat filters; those filters are $159 list...! p/n #68464622AA
So I expect those are washable at that price. That would be a pretty expensive item to replace every 30K