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What happened to the convex hones? Only cupped ones on the bay.

You're right: this is not honing but rather part of routine edge maintenance in those days, the days of solid wedge razors and no electricity tape.

A meule is a convex stone by definition as it is round. Many here use tape when honing true wedges. Both serve the same purpose.

When flat polishing hones can no longer sharpen the razor Perret...

For those who read French: page 34 of this document:
https://books.google.de/books?id=1ixFAAAAYAAJ&printsec=frontcover&hl=de&source=gbs_atb#v=onepage&q&f=false

M. Perret recommends a grinding...

This is an old text relating to times when hollow grinding hadn't been found out yet. Wedge shaped blades used to be hollowed to some extent to make sharpening possible.
Jean Jacques Perret...