Peter Clark wrote:

I seem to recall that ATC isn't responsible for not correcting
mis-heard readbacks so don't count on that, ever.


Not so. Controllers are still responsible to insure readbacks are correct.
That was never changed and never even proposed to be changed. It was widely
misreported.



Order JO 7110.65S Air Traffic Control

Chapter 2. General Control

Section 4. Radio and Interphone Communications

2-4-3. PILOT ACKNOWLEDGMENT/READ BACK

a. When issuing clearances or instructions ensure acknowledgment by the
pilot.

NOTE-
Pilots may acknowledge clearances, instructions, or other information by
using "Wilco," "Roger," "Affirmative," or other words or remarks.

REFERENCE-
AIM, Para 4-2-3, Contact Procedures.

b. If altitude, heading, or other items are read back by the pilot, ensure
the read back is correct. If incorrect or incomplete, make corrections as
appropriate.