What's the purpose, you might ask?

Well, first of all, spite. They VERY MUCH don't like users being able to repair their devices, (or for that matter have any leverage or meaningfully being a part of any conversation at all) - because that gives them power over their devices, which Apple had tried its damnedest to rest from them ever since the invention of the iOS business model (because it pretty much relies on an individual having as little power as possible, and that's how they make money). But by the new legislation, they have to provide tools, even if at barest minimum possible. And they're mad about it, and they are not afraid to show it.

Second, but most important - it's an attempt to divert people from repair bu making it appear completely unappealing, sketchy and dangerous endeavour, distancing themselves from it as much as possible, while still maintaining some legal credibility - but not much, just so far as it flies under the most people's radars.