They have scrubbed much more than that specific interpretation:
Go to the USCIS website and search for:
“Reacquisition of citizenship lost by marriage”
When you go to many of the links that returns they have the same statement that the page no longer exists.
They did a large general scrub job.
try thomas.gov and look in usc.
If you go to the main page that lists all the Interpretations, you'll see that none of the links work. Some of them bring up that error statement, some of them just bring up a blank page. This suggests that it's some technical glitch rather than an intentional scrub--it it were intentional, they'd have taken down the index page too.