To answer your question, I don't think anything changed on YouTube's side.
I went to your link:
https://www.youtube-nocookie.com/embed/A2_yg19Pu7Y?start=150&version=3&rel=0&modestbranding=1&autoplay=1&loop=1&playlist=A2_yg19Pu7Y" allow="autoplay;accelerometer;clipboard-write;encrypted-media;gyroscope;picture-in-picture
And it started at 2:30, like you wanted. That being said, you have a blank space between ...playlist=A2_yg19Pu7Y"
and allow="autoplay...
, and it looks like your double quotes may be escaping the string. Try deleting that blank space and your video will hopefully work!
Edit: I just did a little research and found that "allow" is an HTML attribute, so the link should probably work as it is at the moment. That being said, if you haven't tested it already, then you should try the whole link as one string for the src=
attribute to make sure its working.
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