Not that it matters, but I think there are three possible scenarios to this leak.
1)The most obvious is someone in one of the liberal judges chambers leaked it to help the Dems kickstart and fund raise for the 2022 Election campaign.
2) Alito leaked it because Kavanaugh or Barrett was having second thoughts and by showing the conservative world where they 'should/could' be, bringing maximum pressure not to be branded the conservative that torpedoed everything a generation had worked for.
3) Roberts leaked it. This is the most subtle possibility - That Robert's doesn't want this decision because of the damage to the court institutionally, and that by letting a Kavanaugh see the demons ready to be let loose, he thinks he maybe be able pull him or Barrett back into a less controversial and more incremental ruling.
My money remains on 1, but 2 and 3 are intriguing.
And of course this is assuming 5-4. If the Chief is with the majority, then only #1 remains.