Earlier quoted context omitted.
He works for GitHub and has probably never written anything in his life: https://okfn.de/en/vorstand/
He started at GitHub 3 years after the article was written. Don't think GitHub's interview process takes that long. ;)
However, the broader issue that Microsoft has infiltrated OSS and its organizations successfully by hiring and donating remains. It would not surprise me at all if they now hire people with an ostensibly "freedom fighter" background for credibility.
Look at how many people here cite his (former?) membership in the Pirate Party for credibility! Party membership means nothing. Politicians (in general!) change their minds, can be bought, etc. The Green Party in Germany started out as a peace party and has been used repeatedly to lend credibility to the Kossovo and other wars.