Yeah, it's a good think HKs business registry is public. Still think Bitfinex should put the info online tho. Why not?
They have already put the company address in the fiat deposit page.
However, that address probably is just a proxy address (some sort of proxy secretarial service, you may think of a virtual office). No staff of Bitfinex would be working there as their real physical office should be in somewhere outside Hong Kong.
So, is it really important to put the company address info online?