accelerating universe conundrum, help me find my logic flaw please

Painius writted :

...there is still no possible way
for us to sense either an expansion or a contraction
of space-time. *No way.

But it is possible to read telemetry from denser, *contracted* space,
transposing the readings onto local space which is not only expanded
but stretched Sun-ward. This has been done routinely with the Pioneer
spacecraft, with the discrepancy between the readings being
interpreted as an "anomaly". The PDT gradient of the Sun's gravity
well has never been recognized to exist, much less acknowledged as
causing the anomaly.