"AI will take over almost all the work of software engineers (SWEs) end - to - end in just 6 - 12 months!"
What you describe is >50% of the job of SWEs, even when they write all code by hand.
Are you saying that "for many start-ups", this isn't done by SWE's but by some other career type or are you implying that it's just the code written (and first review) is replaced by AI?