It's hard to judge without digging into this spaghetti mess of files. But having the word retarget in your code seems like straight up lying to me. Tracking is

It's hard to judge without digging into this spaghetti mess of files. But having the word retarget in your code seems like straight up lying to me. Tracking is more ambiguous a word and I couldn't find where they define the userid. But however it is generated, it reads like it's unique. And in order to retarget users, you'd have to track which products they've viewed in the first place, that would imply storing browsing history (they deny storing user info as well) and uniquely identifying users across websites. Given the coding style, I don't think the person(s) who wrote this code is/are doing anything clever other than what it seems.