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What you write is true, but that is why I recommend using very thin self
adhesive foil on the glass plate. This will reduce the rolling of the grit and
allows you to true your stones without losing...

Don't worry about this. Just get a thick piece of glass and use
light pressure whilst flattening.

You could also buy a small granite surface plate. Stick thin self
adhesive foil on it and...

Being lapped with a diamond tool does not mean it is flat. Take a
precision straight edge and check it.

As someone who has lapped quite a few plane soles, I disagree on point
2. If the tile has...

That last sentence might be true, but float glass is very flat whereas a piece
of granite tile? Who knows.

Traskrom use thin(0.1-0.2mm) self adhesive foil on the glass plate. This way
the glass will not get abraded.

Another thing after you have flattened your stones this way, I would use a diamond...