I want to give them the benefit of the doubt and say perhaps it’s a deep freezer that is only opened occasionally, and I guess is pretty well sealed as long as it’s closed.
The kitchen appears to have one of those built-in fridges that matches the cabinets:
Kinda have to, if the building is older than widespread home washing machines.
The houses I grew up in were both Victorian so bathrooms were built in only the 80’s or sometime like that, so they were on the ground floor and quite large. Both had the washing machines in the bathroom and not the kitchen due to this. The bathroom acts as part utility room.
More modern places I’ve lived lack any form of utility rooms. In my current flat the washing machine is in the kitchen, there isn’t plumbing and space anywhere else for it.