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Seems like an odd development. Just seems completely souless place potentially.
It would work as offices or workplace.
Healthcare could just mean a dentist surgery or an osteopath.
wildwest-
Yes, it's anyone's guess how it would work out in practice. It seems from the illustrations that they're planning deep-reaching light shafts around the perimeter of the square, but with a few exceptions the history of underground malls isn't that great. It would need the right mix of uses to be busy at all times, but if you were to put a few nightclubs in, for instance, you'd end up with a lot of closed shops and only a few places open in the evening, which wouldn't look too attractive.
Still, they would probably get their money back in if it was used as a setting for a James Bond film and millions of tourists wanted to visit it after that.
Oliver Schick
A very interesting application here:
https://www.standard.co.uk/news/london/underground-70s-car-park-in-heart-of-west-end-to-be-turned-into-100-million-shopping-complex-a4280046.html
No mention of retaining any car parking in the location, which is obviously easy to reach by public transport.
Equally obviously, concentrating more retail in Central London is yet more over-centralisation.
I assume 'healthcare' will be exclusively private.