Cool video. TL;DR : heating dessicant works to remove moisture from it. This applies to loose dessicant as well as the bagged ones. Microwaving at the lowest power level works rather well and what the author said they will do from now on. Downsides are that sometimes the microwave pops/damages the dessicant because of the excessive heat (meaning the packs begin to wear out over repeated reheating times) or some packaging types melting. Microwaves work pretty fast as well.
A another option is a mini oven at 110 degrees which takes longer than the microwave but doesn't damages dessicant.