Of course, that's blatantly false, taken literally. A 2" diameter 10"
long solenoid coil coaxially inside a 2.5" ID grounded conductive tube
will not have the same phase shift as the identical coil inside a 5" ID
grounded conductive tube, and neither will behave the same as the same
coil included as a loading coil in Cecil's mobile antenna. It won't
even have the same inductance in each case.

Before you say, "Give us a break, Tom. Of course it won't and clearly
that's not what was meant," just consider how literally both the
posters and the lurkers here take things.

AND in fact, as shown in the simulation I just reported on, the
coupling between that coil and the magnetic fields of other nearby
components does affect the performance of that coil. In general, when
the fields, electric and magnetic, around any component interact with
their environment, a change in that environment will change the
behaviour of the component. Thankfully, we have a lot of components
where that effect is minimal at the frequencies of interest, but we do
need to take note of cases where the effect is important. I DAILY work
with tiny components that DO behave differently, depending on their
environment. At several GHz, seemingly small couplings can be very
important.

Cheers,
Tom