Proofs by picture arent proofs though. And how would you even convey by picture that two line segments are of the same length. Or that if you drew C and D as separate points they turn out to be the same point?
Those look more like proofs with pictures, than proofs by picture, but I'm too lazy to get involved into the obscure notation of that book and check whether a random proof from the book would be equivalent to a modern proof from a standard textbook.
Altough, judging by the old timey language of the book, it's possible the book predates Hilbert's axiomatization of Euclidean geometry and the proofs in it were good enough for the standards of its time.
In modern mathematics proof by picture generally means you've drawn / pointed out a single example, possibly wrongly or in a way that doesn't generalize, and because you've shown that one example holds you assume all possible examples hold. That, obviously, needs not be the case.
