To be clear, I am not questioning that Steve Jobs spent a while working for Atari; that much is indubitably historical fact. Apparently he joined the company in 1974.
Atari was founded in the summer of 1972. According to https://www.landley.net/history/mirror/atari/museum/Atari-Timeline.html by 1974, the company had not only made tens of thousands of Pong machines, but also developed a number of other games, generating millions of dollars in revenue.
According to other sources, Atari's hiring process was at least in the early days not very selective, and they had a lot of trouble with theft, which presumably led to firings, so if employee number 40 were hired in 1974, that would mean the current employee count at that time would be significantly lower.
Did they really accomplish all that with so few employees?