One more update, guy under masked name and account is from my company and i provided him additional details internally. Usual expected workflow:
1) contact to author/maintainer of plugin, wait and get (or no) reply
2) After some delay week-month back to maillist and describe situation
3) Then based on situation maillist will provide commit permissions or help with review/merge/release (maybe i will do it).
Assuming that person don't want maintain this plugin in future i suggest firstly wait initial author.