Of course, that begs the question as to who they are. Their first online appearance per the Wayback Machine is September of 2009, so they look to me like a preliminary run of Commie Core.
With all due respect, I am not sure exactly why you are refuting my source, http://www.the-conjugation.com/english/verb/sneak.php. However, I am not sure I agree with your premise/conclusion.
So first appearance of the website http://www.the-conjugation.com/english/verb/sneak.php is 2009 on Wayback Machine. Hmmm. Just because the website did appear on Wayback prior to 2009, does that mean the site did not not exist in any form prior to that date? I ask because I truly don’t know...
Are you implying that since website was not noted on Wayback Machine prior to 2009, the website is a tool of Common Core? They are somehow subverting English language with the inclusion of “snuck?”
Is Merriam Webster traditional enough for you?
https://www.merriam-webster.com/dictionary/sneak
According to the video below, “snuck” appeared in the 1800s. Over the past 120 odd years, by some estimations “snuck” has become the more common form in the US...So it seems to have been in use long before Common Core. The video is interesting viewing IMHO.
https://www.merriam-webster.com/video/sneaked-vs-snuck
There are many other websites with similar discussions.
Therefore, again, with all due respect, I conclude that use of “snuck” in title is appropriate.
Looks like you're the ill informed one...
Sneaked or Snuck: What’s the Difference?
The History of Snuck
Snuck is an American creation dating back 1800s ¹ as a nonstandard, regional variant of sneaked.
It was met first with widespread condemnation, but snuck has, with each passing generation, become more and more widespread in its use.
In fact, the below chart shows just how popular it has become in the United States, being used with almost equal frequency as the traditional sneaked.
