Follow-up/addendum: I reached out to the Open Zeppelin team And they did not identify any specific deficiencies with the Datamine smart contract (
https://forum.openzeppelin.com/t/question-on-smart-contract-inheriting-from-openzeppelin-erc777-implementation/3328/2). This does not mean that there are no deficiencies, however, it means that whatever deficiencies exist (if any two) are not widely in publicly disclosed. Despite my profound skepticism for this project, this news is good for them. Now they just need to solve the inflationary mechanism that is built into the project. Kudos team - your code isn’t overtly fucked.
Thanks for checking, for reporting this and for being constructive. Its encouraging to see the efforts to be objective despite the existing bias. After all, we all should be interested in 'knowing the truth', not in 'being right'. Maybe at some stage you will become a supporter

The inflationary mechanism is there, however the mechanism for equilibrium is there too. Lets hope the team follows things and will make things right in case if anything moves not in a right direction. Being able to correct mistakes (if any) is as important (if not more important) as being able to avoid mistakes at planning stage. And we still don't know for sure if there is any mistake done.