IMHO you’ve got nothing to be concerned about.
The specificity concept should not apply to Erg (IMHO). If you did that Bluebell workout outside, in perfect conditions, it would make your indoor workout on Neo 2T look unnatural with ‘perfect’ power. After buying a Wahoo Kickr I went thru a phase looking for this level of power perfection, and in retrospect it was a silly exercise. To each their own, but don’t expect any real return on time invested in pursuing a pedaling style that doesn’t translate to anything you do outside (or better performance).