Phi, coverage by strata insurance is one of those things that seems to be very much open to interpretation, firstly by Strata Managers many of whom are commission agents of the insurer, and then by the insurer themselves.
That said, I’ll stick my fins out by suggesting that even though kitchen cupboards are generally covered as “lot owners’ fixtures” under strata insurance, the “event” that caused the damage was a burst hose within the lot, and that I’m afraid makes the repairs your problem, and likely claimable under contents insurance provided the strata insurer provides written advice that it won’t cover the event.
As an Owner, there’s no impedement to you making your own enquiries with the strata insurer, but the above is how I see it.