Good for him; hindsight is always perfect.
In reading the current snapshot I observe that none of the quandaries that plagued the original effort have really been solved. Furthermore, the realities of the ICANN of 2019 are very different to those of a decade ago when the consequences of the TLD round were unknown. Many of the barriers that the original program sought to address no longer exist.
I am but one voice, long since departed as an ALAC member. I know what it's like to dump heart and soul and hundreds of hours into futule ICANN activity, and the Applicant Support TNG effort shows all the promise of a splendid repeat.
With or without ALAC's participatioon, Applicant Support TNG will likely fail just like its predecessor.
With or without ALAC's participation, the benefit to end users of even a marginally useful Applicant Support TNG are non-existent.