AFAIK the policy is not to review anything sold by BPL. This made for some odd situations like a canister stove review a while back (well, years, actually) where the Vargo Jet-Ti was excluded from a canister stove roundup for this reason, though you could tell from the product descriptions and stats that it probably would have won. I understand and applaud them for being so rigorous in preventing bias, even though I personally trust the reviewers to not intentionally skew things.
I'm pretty sure the policy does not extend to excluding reviews of competing products, otherwise, given that BPL sells at least one item in almost every category of gear, they wouldn't have much to review! (shoes I suppose).