Small tiling patch onto bonding

I need to patch up a small portion of untiled wall in my bathroom. This was previously exposed breeze block.

Had a plasterer around last week to plaster the ceiling and he also offered to apply bonding to the exposed breezeblock saying that I could PVA the bonding and then put some tiles on it. Which I okayed because he seemed to know what he was talking about. I've since then discovered online that bonding is not a suitable substrate for tiling onto.

Given it's a small area (one row of tiles at floor level) and will be mostly covered by a toilet and vanity unit, can I just PVA this and then stick some tiles on this? The tile size will be 250mm x 400mm.

Cheers

Yeah

I have in the past with no problems

I’m now reading that I should use SBR on the thistle hardwall instead of PVA. Is that correct?

if so how many coats of SBR should I apply and how dilute would each coat be?

Given it’s such a small area and at floor height, I’m fine with tiling to the hardwall directly provided I know how to seal it properly.

You can buy a small bottle of tilers sealer from DIY store. It's SBR for tiles.
Use that.
Will say on bottle what you need to do or look online and read the data sheet