I never said the communion in the hand invalidates the mass, but that the non-emergency, non-necessary indult is a Sacrilege. Such sacrileges are so intertwined with the new liturgy that it makes the new mass immoral. Much like having a water gun fight with holy water doesn’t de-sanctify the blessing, yet this activity is an abominable sin. So, the practice of communion in the hand does not invalidate the mass, but it desecrates a holy activity, and (it is one of many actions which) makes the new mass immoral to attend.
If a person approaches to receive communion in the hand, with no emergency situation, then the priest/deacon who participates and the layman commit a Sacrilege. It’s an indult, not the norm. Just like it’s an indult to go to mass on Sat night. Just like it’s an indult to eat meat on Friday. Unless there’s an extreme reason, the law says it’s not allowed. All the modernist priests/bishops forget to instruct the faithful about the “fine print” and the faithful go along with whatever novelty happens without question so the sacrileges continue. But they are sacrileges, make no mistake.