Bad written article here's the rule:
The expanded jerseys will allow running backs, tight ends, fullbacks, H-backs and wide receivers to wear numbers 1-49 and 80-89; defensive backs can choose from 1-49; linebackers 1-59 and 90-99; offensive linemen 50-79; and defensive linemen 50-79 and 90-99. QBs, kickers and punters will remain in 1-19.
https://www.nfl.com/news/nfl-passes-rule-expanding-eligible-jersey-numbers