TripleATeam
G.O.A.T.
The only valid point there is they may add more Big Titles. What counts as one now will remain any title worth 1000 points or more, as that's on the ATP site (which will be cataloged).The term 'big title' only came into play in 2016, cooked up by ATP to make ATP tournaments look cooler and help the (resumes of) younger players struggling to break through at the slam level.
In 20 years from now we may not even remember what counted as a big title in 2024, with the number of masters events possibly growing (hello Riyadh) or other tournaments joining the group, and their perceived importance taking a bit of a hit. The tennis scene could go through some radical changes and people might then argue about 'platinum' titles or something. Worse, tennis may not even look the same down the road and a new code of the sport may become more dominant and popular.
Other records may come into existence that surpass this one in the eyes of the public (Grand Slams + ATP Finals or Grand Slams + Davis Cups or anything else), but that won't be breaking the Big Title record. It'd just be a different record.
As for if they add more Masters or more slams, I think we'd enter another era of the Big Title record and would therefore make that record of a new era. If there was only one slam in the 1970s before the ATP introduced the 4 slams in the 1980s, I'm sure we'd have a Single Slam era as well as a Modern Era, each with their own records.