The ones you listed. Go with your gut. Explore your options and be ready to jump ship if needed is what I’m saying. My experience was corporate cutting back on conferences, then bonuses, then people. Again it depends on company size and industry but you should always have a plan b
does not replacing someone count as "cutting back on people" ?
Yes.
That's a huge attrition rate as well, hard to believe none of them were pushed out either intentionally or by some of the same signals you're seeing.