I was something like 30-35 at D3 cross country nationals twice as the 4th man on teams that finished 3rd two years in a row.
On that team, we had a 14:19 guy (me - and I likely could have run D1 had I run before getting to college ), a 14:25 indoors guy (a 4:10 high school miler who won Penn, was actually a D1 guy who had some legal troubles and transferred) and an 8:54 steepler (also a former D1 transfer).
That was a team that would have done pretty well in meets with D1 teams, but would have been buried in any of the Power 5 conference meets. But any one of those fastest three guys also would have (just) made the travel team for most D1 schools, especially when you put those times in while context of the early 90s. You can also imagine that the same would be true for the two teams ahead of us at cross nationals.
Again, anyone who disputes that D1 is markedly better at the top and deeper is being ridiculous.
But former D1 in and of itself is not a useful descriptor of running talent.
And for the record, I have never used the phrase "All American" to describe myself as a runner despite being a D3 All American. While it is arguably true, it is no more informative of my running talent than "former D1" without additional descriptors.