I see Merriam Webster defines "imput" as a "variant of input" but no other dictionaries have entries (unless you count the Urban Dictionary's "The usual idiotic misspelling of the word input").
Google Ngram has entries for "imput" in books, including a spike in the late 1970s, but even that spike is of trivial volume (<0.00001%), around where you'd expect typos to live.
I see a reference to "imput" in this answer to a different question, noting:
the phoneme /n/ is also highly unstable in English. It tends to change its place of articulation according to the following consonant. For this reason we see words like input being pronounced imput and so forth. This is called anticipatory assimilation
My spouse, a professor in STEM, is seeing this spelling in a few students' works, though this is from a text field notably lacking spellcheck.
Are people starting to actually use "imput" as a valid word, or is it still a typo?
(In other words, am I bucking a trend, yelling at kids to get off my lawn?)