The press release, as I read it, does not say anything about Air France buying any shares. It does say that BA and AF both codeshare with Flybe, and then goes on to say that BA will buy additional shares from those now newly offered, to maintain a 15% overall ownership.
How many Embraers do you get for £60m, in comarison to the current total fleet size ? I would have thought not a great percentage fleet increase.