AOPA article: Piston pilots pay no user fee, but IFR's pay $25

Can people help decipher the AOPA article about who pays the $25 fee
on per
use of the ATC service,

"There would be a $25 per flight "Air Traffic Modernization" surcharge
imposed on all flights. Piston-engine general aviation aircraft,
turboprop aircraft "operating outside of controlled airspace," and
military, public service, and air ambulances would be exempt from the
user fee."

Is this $25 fee paid by all flights including the pistons ? OR is it
saying everyone
flying outside of Class A,B,C,D,E do not have to pay $25. But once
inside one
of A,B,C,D,E, turboprop gets $25 bill, while pistons do not get that
$25 charge ?

Is this an optimistic interpretation, or the text meant something
else ?

I hope the bill that is getting to be passed is not worded this way.

P S