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I think of a saniflo as a loo macerator but maybe it’s just a pumped waste system, as you say.
These days such a system needs an alarm to stop failures causing a flood but if it’s an old install who knows what the setup is, especially as it seems the pump is on the same ring as the hall light…
Sounds like a rubbish system, but it worked fine until the builder filled the electrics with levelling compound so if the building insurer could be bothered I’m sure they could pursue the builder for his mistake.
Basement flat below the sewer needs all waste to be pumped out?