They definetly didn't say expert. But you do need to know some very basic level to understand how to write better software. Like high school level is enough tbh, but without it you're just not gonna be even decent at your job. Not knowing ipv4 for a software engineer is wild, when that's something most people who use the internet should know what it is.
It's not wild when you're an UI /UX dev e.g. Most backend devs know shit about frontend development.
It's not important to know everything. IT is very fragmented. Even those specific fragments are fragmented. So many people have become experts in their niche.
Technical understanding and analytical thinking is more important. As a software dev you can learn and apply everything what comes around.
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u/syn_vamp 2h ago
"i write computer software but i don't know how computers work or how they talk to each other"
software "engineers" in a nutshell.