The author seems to be trying to fit a C#-shaped peg into an unsuitably academic F# hole.
C# is one of the best languages I've ever used, it's amazing how well it holds up in my (admittedly large) niche. But one language can't be everything to everyone.
For example, the complaint that something doesn't print in a C# notebook if a semicolon is appended seems so far out there in the margins of usefulness I'm having trouble finding back the page.