Agree, the second post is a giveaway - plus some words French professionals don't use such as "plan pension". Same for the thord. The first post is really good though.
(plan pension is a literal translation from dutch: pensioen plan)
It does looks very fake. The engineer says he is also a hobbyist writer, so maybe he has a taste for romanticism, but i think it is way too much stylized to be a real testimony. It definitely reads like what contemporary french author writes.