I think the rule for Kernel always has been or certainly was that different version due to hops are only added when the hops are on the front of the label. Therefore I would rate under:
What Mr Pink says is essentially correct. I guess small text on the back label doesn’t pass the idiot-proof test for distinguishing a different beers. Plus, in some of these borderline cases, we didn’t realise there were multiple but not clearly marked versions until well after the event, resulting in shitloads of ratings under a single entry that we wouldn’t have a clue where to move to. So sometimes the decision might have been influenced by whether we caught it early enough and could add appropriate editorial notes before too much damage was done.
Also, the Kernel landscape has changed somewhat since the early days. Initially almost all the output was bottled so there was a fair chance that people would have access to the bottle when entering a rating & could pick up less obvious stuff on the label. Nowadays a lot more Kernel is available on draught and, in those fancypants new craft beer bars, you’re usually going to be reliant on chalkboards, which often omit subtle details. If they’re even on the keg in the first place.
An alternative approach is to have separate entries for these subtly different variants but also a generic entry for those cases where raters don’t know which one they had. I think we’ve done that on occasion.
Re bars not making a distinction, at Waterloo Tap, they just had Kernel IPA, which was Centinnial, very distinctive, they changed the barrel with a Nelson Sauvin and told me it was the same beer, very different, and annoying as they didn’t seem to even clear the pipes.