> what is the typo? "apart" that should have been "part/a part"?

Yup, "apart" is probably a typo. I imagine the author meant "a part". If two things are joined then they are "not apart" and hence, reading literally, the author was involved with (or joined to) the decision. If two things are separate then one is "not a part" of the other.

Perhaps it's a trait of being a programmer but I tend to unconsciously read things as written and then try to infer what was meant by the wetware between the ears. This makes me feel sad inside each time I have to do it. I find the confusion of "everyday" vs. "every day", "allot" vs. "a lot", "your" vs "you're", the grocer's apostrophe, etc, etc extremely uncomfortable to see. It's just as unsettling as:

if((a !== b) { console.log('a and b differ'); }

But then, not everyone flaps and that's OK[1]. So, in an attempt to stay on topic rather than just venting, I'll say that I'm not pushing for speakers who have a habit of including eggcorns in their slides to be excluded from conferences on my behalf.

[1] https://www.amazon.co.uk/Why-Johnny-Doesnt-Flap-NT/dp/1849057214

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