Guy King wrote:
The message
from "." contains these words:

Seems clear enough to me. The clamping by the nut should tighten the
olive onto the pipe sufficiently to indent the pipe all the way
round - that's how they work.

/deform/ the pipe (sic) ?

That's right - deform the pipe. The olive will be pressed into the
pipe, deforming it in a ring all the way round.

What's wrong with that?

1/ it's copper /tube/

2/ if the olive deforms the tube the joint is over tightened and will weep