The leaks were sourced from hacking his Discord account. The evidence is as straight from the source as it gets. Orion's response on his alt account was that "incriminating things" would be produced from these leaks, which based on the methods in obtaining the leaks is corroborating their validity.
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Even in his final cope message, he doesn't question whether or not they're real, but whether they're a reflection of "fantasy" of his. He has also at no point denied the validity of the leaks in any form, only his sincerity when he sent the messages.
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He admits the account was hacked. He doesn't deny the conversations. By admitting the leak is from a hack, he's again confirming the validity of the leak. He references the conversations and admits they're real, but tries to claim they're being spun out of context and it's all about loli/shota. All he wants you to believe is that every message he sent was to facilitate fantasies, but he still wants you to believe they were all real and all sent.
The original leak was a full ZIP archive of all his messages too, not merely screenshots of some DMs here or there.