Your video specifically mentions triggering a 'cytotoxic T-cell' - that's a cell that kills virus-infected cells. What's more, it doesn't explicitly state that

Your video specifically mentions triggering a 'cytotoxic T-cell' - that's a cell that kills virus-infected cells. What's more, it doesn't explicitly state that all the bodily cells that receive the foreign mRNA survive. I'm pretty sure they're attacked & destroyed by the immune system for their emission of foreign proteins - that is, they "appear infected". And, some time after the mRNA was introduced – days? weeks? – it's all used up, because unlike a full viral vector, it doesn't code for more invasive genetic material, only proteins. And, the cells it hijacked are in some combination, destroyed by the immune system or revert back to normal, non-threatening operation. If you have a more specific reference that denies the mRNA-altered cells are attacked-as-if-infected, I'd appreciate seeing it. But that video doesn't make that claim, and in fat the reference to 'cytotoxic T-cells' implies the opposite. (Also, as the sibling response elaborates, the problems with Adenovirus-vectors are not limited to PEG reactions.)