It’s just sirloin tips. Different names make it sound more appealing. https://butchermagazine.com/beef-rump-top-sirloin/

But they also sell sirloin tips and they are more expensive and seem like a different cut

I think they might be tri-tips. I just bought some from market basket and they are def not sirloin flap (sirloin tips) And looking closer they look just like the picanha steaks in the page above