I have some experience dealing with young women athletes who were anemic and with low ferritin. I’ve never seen such low numbers before however. No doubt your were massively impacted by that during those years. How that will affect you years later I can’t say. You do not say what your current numbers are. But…..I have seen repeatedly that ferritin below 30 and the athlete is pretty worthless in terms of reaching her performance potential. Ferritin below 50 will still result in performance degradation however.
If you are just re-entering training regular running then that pace does not seem so slow for aerobic base work. I recommend you continue to train below 169 exclusively for a few more weeks and retest AeT and see if it has improved (both in pace and HR). Continue to monitor blood iron markers.