Alright, I checked ExpertFlyer for you:
TWOV (Transit Without Visa)
Passengers with a confirmed onward ticket for a flight to a third country within 24 hours. They must stay in the international transit area of the airport and have documents required for the next destination.
I hope that you are aware that TWOV only works if you fly X-ALG-Y, with X and Y being different countries.
They also require a COVID tests if you've been in China/Macao in the last 10 days before your arrival into ALG.