And so I stand corrected.  The important sentence is

"
The alternate move sequence given by an RAV is one that
may be legally played by first unplaying the move that appears immediately
prior to the RAV.
"

for as it stands, the 1.e4 (1..d5) example satisfies the formal
syntax, IMHO.   This sentence alone forbids that.

I was under the impression that RAV allowed illegal moves, as in
commentaries.  But the sentence that I was remembering :

"
Because illegal moves are not real chess moves, they are not permitted
in PGN movetext. They may appear in commentary, however. One would
hope that illegal moves are relatively rare in games worthy of
recording.
"

clearly now shows that comments are NOT annotations : RAV are part of
the movetext, but not everything that is between braces.  Commentaries
are not even treated in the formal syntax, and so is quite informal,
actually.

Thank you for teaching me something today,

B

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