I've dealt with Doug several times and purchased his pipes many times over the years. I think what has happened is that Doug draws from Pipedia to help enhance his listings, though on occasion I've had cause to question his certainty regarding the identity of certain pipes. Sethile, who runs Pipedia, populates several of the pages with photos from Doug's sales from eBay, and bases this on Doug's eBay descriptions. It's a little precarious in the sense that Doug draws from Pipedia and Pipedia draws from Doug but I'm not sure how much deeper than that the fact checking goes, and many of the pipes are really from Doug's sales and not from a historically curated collection per se.
Case in point: Doug sold a "Champion" pipe as a "Ben Wade" sub-brand. I emailed Doug to let him know that the there was no evidence that this pipe was a "Ben Wade Champion," as it was described in a 1930s Leeds-era Ben Wade catalog as a lower-quality briar with a silveroid band, and we have no hard evidence that Ben Wade manufactured its sub-brands in London (this is an area of active research). He didn't respond, nor did he apparently feel the need to update the eBay listing. The pipe sold. Then Sethile updated the "Ben Wade" Pipedia page to include the eBay photos of the "Champion" under the heading "What appears to be a Ben Wad Champion, courtesy Doug Valitchka."
I leave it to you to decide how factual or historically accurate this might be. I personally wouldn't have updated the Pipedia page with potentially misleading information based, ostensibly, on a single "Who Made That Pipe" entry (which does not provide dates or city of manufacture), but this happens all the time. In any case, my opinion is that it's always best to rely on multiple primary sources of evidence. If you ask me whether that's a "real" Ben Wade Champion, I'd tell you, based on primary evidence: maybe but we have absolutely no hard proof, and I can tell you conclusively that this is not a 1930s Ben Wade Champion.
Furthermore there are entries for an English-make "Champion" manufactured by Ben Wade, as well as "John Pollock", "Costwold Dist.," "Hall & Fitzgerald," and "Sam McLardy." On the surface any of these, without deeper digging, may also have manufactured the pipe. Why not? The evidence goes no deeper than Wilczak & Colwell.