After investigating, it seems your sudden growth is far from realistic.
Statistics are showing that all the views and watch time on that video came from one day alone, and it hasn't managed close to that since then. Most popular videos will have a rising period and then a declining period, and almost never have a sudden growth period. Furthermore, only one of them displays realistic community engagement while the others have exactly four likes on the pair of them.
I'm not suggesting that you may have gotten these statistics illegitimately, but there are no patterns to suggest they were legitimate.