Halvings can only account for bitcoin's supply, not necessarily the demand. Theoretically, even with literally zero remaining mining rewards, the price still wouldn't go that high if there wasn't a good amount of demand. So can you tell us how you made that calculation?
This is just their calculation where it doesn't have any strong proof that it might came.
In the end, speculation is based on many assumptions, such as that halving will have a positive impact on the price. I think all, or almost all of us on the forum assume that the demand for Bitcoin will continue to grow over the years. I hope in fact that it is true what is said that today we are in terms of Bitcoin usage as in internet usage in the year 2000 or so. So if demand grows and supply shrinks with halvings the price can only go up.
I do believe, as I commented in a thread, that the returns as the cycles progress will tend to decrease in percentage terms, to be more modest. So, for the next cycle I think pretty sure we will pass $100k but I doubt more that we will pass $200k. I would like to see it, but we'll have to see.