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It's a fairly absurd advert with those hall of mirrors style photos. I assume the suggestion is that it's a 1992 Explosif, so it ought to look like the example below. It looks as though it has a 15cm head tube, in which case it would be a size 19, but the distortion makes it hard to tell.
He does mention the shaped tubing and that is the best evidence that there's an Explosif under there. It's much easier to see in the photo below - both the tapering of the top and down tubes getting deeper towards the front, and you can just about tell their oval shape from the shape of the welds. Personally I can't see any of that in his pictures, so it's just a matter of taking his word for it.
Attachments
1992 Explosif frame size 18 13cm head 16.5 to tt.webp