No. This is someone using my hosted chasing software auctioning on my site. As many people do. As many people do on DL. There are also many people using my software who don't auction on my site. So to answer your question - as I don't control what people chase or how/when they chase - no it isn't 'evidence' of collusion because there is none.
Some people aren't members of this forum (in this case the owner of that tag) so don't come here to tell people about the auctions - so I do. Others do, look at a lot of the other threads from people in the same situation who have made posts themselves - some today.