Anyone and everyone has access to change/modify wikipedia articles, and these so called "commentators" and the like can be pretty dubious, and can actually be competitive.

One business I had put up online, and tried to make a wikipedia page for after 2 years operation was removed by a competitor's friend who has such access, which is no more than a conflict of interest.
Since I had followed all guidelines of making the page in the first place, but nope, removed, for an illegitimate reason.

You can't trust it with a grain of salt, except for things predated, bigger, and irrefutable.