Yes, but, there are cracks along where
the wall attaches to the floor.
There might also be cracks in the floor
itself. �So rather than the
radon coming up into the basement,
basement (and house) air goes
into the crack.-

Sealing all cracks is also part of the standard radon mitigation.
beyond which the fan, designed to run in a moist environment just
pulls a minor suction on underslab, having felt the exhaust its just a
small amount.

Many lung cancer cases of non smokers ot exposed to smoke are traced
back to high radon levels in homes.

in the case of homesale time seller has no choice but to spend the
money to get home sold.

my home sits above road grade and has basement water issues.

I have started installing a interior french drain and have been
thinking if it flows to daylight radon too would be naturally
exhausted, no fan or expensive system.