The interference effect is real. It is also smaller than you think, and it depends entirely on modality, volume, proximity, and intensity. Here is what concurrent training meta-analyses say about combining cardio and lifting without sabotaging either.
CrossFit BC has coached Vancouver since 2008, first in Yaletown and, since 2019, from 278 East 1st Avenue in Olympic Village. We run CrossFit, HYROX race prep, Olympic weightlifting, gymnastics, and one-on-one coaching seven days a week, with every session scaled to the person doing it.