That's not accurate. They retired SICP and added a new introductory course [1] based on Python to placate the suits. Neither Sussman nor any of the other SICP folk is involved with that.
Sussman created a follow-up course to SICP [2] which is still based on Lisp and still being offered today.
[1] https://irreal.org/blog/?p=11127
[2] https://groups.csail.mit.edu/mac/users/gjs/6.945/