who was the 77-year-old gentleman who was accused of lying by not claiming that he had two cars

His CFO Allen Weisselberg. The last section you are asking about is in reference to this case (Weisselberg did 5 months in Rikers for it last year): https://manhattanda.org/d-a-bragg-trump-organization-cfo-allen-weisselberg-to-serve-5-months-in-jail-testify-in-upcoming-criminal-trial-against-trump-organization/

Trump brought him up because Weisselberg was also a witness to the Stormy Daniels case. But neither side called him in to testify. Sidenote, Weisselberg is currently doing another stint at Rikers, after pleading guilty to perjury at the Engoron civil trial earlier this year.

who was the 77-year-old gentleman who was accused of lying by not claiming that he had two cars

His CFO Allen Weisselberg https://manhattanda.org/d-a-bragg-trump-organization-cfo-allen-weisselberg-to-serve-5-months-in-jail-testify-in-upcoming-criminal-trial-against-trump-organization/