The story was posted in 2018. Do you know when it happened? (Or at least an approximation.)
> When we were ready to head back to Teterboro Airport, I got to a phone, [cell phones had not not yet been invented], and called Departure. [...]
That's not precise enough to really know. It could mean "before the 90s", "before 1983", or even "before 1973". The plane's registration is from 1977, so TFA can't mean literally "before cell phones were invented". Though I suspect it really means something like "before cell phones became widely available to private pilots", which presumably means "before 1990".