The man speaks truth.
UFO is not a sequel to X-COM it's plot does not pick up the Marsec universe and tell us what happens next. For that you need Laser Squad: Nemesis, which I haven't played and probably never will, because it has an annual fee.
UFO has it's own story and characters, even if all the races were ripped off from X-COM. (The Sectoids are now called reticulans, the cult of Sirrius is now the Servants, and the Blue guys from XCOM3(name?) are now called beastmen and they wear red) The Marsec M-2000 is now a Laputan F-2000, but it does the same thing etc. Really UFO is much more refined and holds to the tradition of making the graphics as good as the technology of the day will handle without a brand new machine, and keeping the gameplay cutting edge, but it is it's own thing. Really calling the thing UFO and talking about how they are the spiritual heirs of X-COM would be dishonest if the soul of the original wasn't so tightly woven into their work. Capturing aliens has gotten harder and requires a deliberate effort, which is good, but the overall difficulty has gone down and the plot twists have gotten better and more numerous, which is excellent. The player characters have actual personalities and relationships and the plot is vast confusing and satisfying, making it like a blend of Jagged Alliance(another great Microprose series) and X-COM on modern hardware.
It's a dream game really.