I've watched the entire video, more than once. He says it's a message for Emira customers - I read that as people who have placed a deposit or committed their order. So your definition of "EXISTING" is the same as mine, isn't it? People who have placed a deposit or order. It clearly doesn't mean people who are thinking about placing a deposit, or people who might place a deposit/order in future - they aren't customers yet.
So, what group of cars does that promise apply to? You said only the first year of production V6 First Editions:
He doesn't say that anywhere, or imply it. You've just assumed it.
What about all the people who paid a deposit before this video was released in mid June but are not getting a V6 FE? They got the email too and can reasonably infer this applies to them, even though their delivery might now be in 2022, 2023 or 2024. Lotus have confirmed that to people who have asked.
@Twin Cam has confirmed it here too and he will be an i4 in 2023. Why would he be "case by case", when the email and video clearly included him in a large group of deposit holders.
Yes things have changed and inflation pressures, delays, energy costs, exchange rate swings and all manner of things may force Lotus to have to adjust pricing. The point here is, Matt made a commitment to a large group of people in mid June that the prices deposit holders up to that point had been quoted would not increase.