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@Dammit
Absurdbird seems to know what he is talking about here, so I'll wade in with some badly informed assumptions and conjecture.
If you are going to tank it, then what kind of plaster it is does not matter, surely?
The BAL tanking layer will seal it, even if it is hygroscopic when untreated.
You might run into an issue if you plaster the wall to flatten it, as larger tiles can go beyond the bearing capacity of some plaster quite easily.
Easiest thing to do might be to dot and dab (it's like magic it's so easy) cement boards (wadi/aquapanel) onto the brick work, giving a nice flat surface, then tiling that.
You'd not need to tank the boards, either.