It is also here & a few other places:
https://bitcointalk.org/Satoshi_Nakamoto.ascWhen you import it into a PGP program, it shows that the key was created 10/31/2008 and includes the email address "
satoshin@gmx.com".
Since the archived version on bitcoin.org only goes back to Feb 2011, yes, we'd have to trust that the key was not altered between the time Satoshi first added it to the website and the date of the archive. Seeing as how Satoshi was communicating with others up until April 2011, its likely that its the same key. Updates to DNS records for bitcoin.org suggest the domain didn't leave his control until May 2, 2011.
According to theymos, sirius was also an operator of bitcoin.org during this time -- he would have no motivation to change the PGP key either.
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Fast forward to Dogecoin and he does it again.
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To quote satoshi,
WTF?