Well, “alot” truly is NOT in the dictionary, but most dictionaries recognize the informal usage of “alright.”
And I believed them.
Then they are not really dictionaries. Who needs a dictionary that tells you that whatever people are saying is “correct.”
The last decent dictionary was the Webster’s Unabridged, 1934. The deluge began with the execrable “descriptive” Webster’s Unabridged of 1960. Or so.