The bias the parent refers to is implicit, I believe, in the selection of information to convey. That is, the choice of which columns and rows to include in the graph in the first place.

They could have included a row for "Open platform for games", or "Has finger detection", etc. Alternatively, they could have included columns for Vive, or Vive+Wireless, and so on.

This kind of implicit bias is very difficult to avoid, however; in general, viewers of ANY online media should already be assuming the viewpoints they're consuming are biased in the first place.

In particular, since the source is the /r/oculus subreddit, anyone viewing this information there (1) already assumes this implicit bias, and (2) is likely to share it.