A rugpull to me is something specifically setup to try and make money by scamming/rugpulling. JuiceSSH has been around for so long, even if it doesn't work anymore I don't feel rugpulled? If it was a year old I'd agree.
If it were advertised at the time as a 1-year rental/subscription then it wouldn't be a rug pull. But the fact that it was advertised as a permanent purchase means that it is, no matter how long you got to use it before it was involuntarily taken back from you.
I mean it seems like they have increased the price, locked previous lifetime purchases (which prompted some of the commenters here to purchase it again at the higher price) and many features (cloudsync, plugins) were killed. All without any communication or a platform for complaints.