If I'm reading the orders right...

Premises that must not be open
The following premises in the general area must not be open to the public—
(a) amusement centres,
(b) nightclubs,
(c) sex services premises,
(d) sex on premises venues,
(e) strip clubs.
p.8

So what's the "general area"?

Whole State other than stay at home areas and areas of concern
The whole of the State is the general area other than an area that is—
(a) a stay at home area, or
(b) an area of concern.
p.41

So brothels will be closed across the whole state.

But how about "stay at home area", or "area of concern"? Because they're not the "general area", can brothels reopen? No: see pages 15 and 25, they have similar clauses.

So it seems that what's happening this year is the same as what happened last year: brothels are being deliberately left out of the reopening plans.