I opened the campus with Gaetan in 2016, and I still remember the first day of the first piscine.
The first... what? Fishes?
Wikipedia tells me that "piscene" means:
Piscine: pertaining to fish.
It is also a French noun meaning "swimming pool"; see La Piscine (disambiguation).
The Latin word piscina (or sacrarium) denotes a shallow basin placed near the altar of a church.
None of these make sense in the context of its later use ("...we started the first cohort with around 300 students, and grew to just over 1,000 over the next 18 months with another 1,000 in the pipeline for future piscines..."). It seems to be used as a vague synonym for "cohort"?