He states on Twitter,
“I would certainly recommend keeping the old domain name for a longer period. Also keeping the redirects in place for at least a year, and three months is too short for a site-move.”
So even if you observe Google trying to get access to these old redirected URLs, you are likely not in bad shape SEO-wise. It is just something Google usually does with its big long-term memory.
Google has expressed it will try old redirects for years and years. So if the redirect goes away, that may signal something new to Google.
Concluding Google Redirect Signals
This is the first instance when Google has officially confirmed that the Google redirect signals last forever, even after a redirect is moved. So now, if you have customers that really want to remove redirects for any reason, if the redirect has been live for more than a year, it is safe to do so from an SEO perspective focused on how search engines work. More importantly, if the redirect is removed over time because of just regular maintenance and it has been a year, you still shouldn’t worry.
