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:
That is definitely not a hot water cylinder, it’s free standing.
It’s possible to have the pipes exit through the bottom or the back. Just seems more reasonable than a fridge?
It’s probably a deep freezer.