I just pictured myself trying to post on a French-speaking forum, and shivered. There is little doubt that I would be worse - at least we can get the gist of what she/he means.
If she or he is not a spammer and really trying to connect to a cycling forum in a language that they are, perhaps, learning, I wonder if she or he actually realizes just how old the threads are? They may simply be focusing so much on the content that they do not realize that some are so old. Of course, they had to do some digging to FIND those old posts, and the odds of a newbie finding so many old threads all at the same time considering the forum lists the newest threads first even in searches certainly does make me wonder.
Outside of the large number of old threads they respond to there is certainly nothing in their posts to say that they are either trolls or spammers, and hopefully that won't change.
I certainly have "odder" posts myself, especially when I start over-thinking things :)