Help? Error in Modern Chess Openings (15th ed.) p.403 - Chess Forums - Chess .com

Hi there, I'm wondering if anyone can help me make sense of this page. Specifically, the issue is with the white moves (4.Bg5, 5.Bg5). My first instinct was that perhaps it should have been 5.e3 (as in the orthodox defence), but line 25 has 8.e3. I then thought that perhaps black plays 4h6 (in response

Help? Error in Modern Chess Openings (15th ed.) p.403 - Chess Forums - Chess .com

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Help? Error in Modern Chess Openings (15th ed.) p.403 - Chess Forums - Chess .com

Why this opening movement is an error? - Chess Forums

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Help? Error in Modern Chess Openings (15th ed.) p.403 - Chess Forums - Chess .com

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