It appears from the article that 90 is the start of convictions in only Brooklyn. There are four other boroughs that still have convictions to be challenged. With a 20 year career, this is extremely significant.
I work as a public defender, not at the appellate level, but anyone who was convicted with evidence from his testimony will have notice sent under continuing Brady obligations so this is likely the very top of the iceberg. I could see the ACLU spearheading a class action lawsuit to blanket overturn all convictions like in Whitley.
If anyone wants to see a documentary that details how blanket reversals of cases can be brought, I would highly recommend How To Fix a Drug Scandal on Netflix.