That's according to a post earlier in the thread from the guy I presume is from JetBrains. It's also similar to the license Epic had for Unreal Engine, before they got rid of the monthly fee.
You seem to be conflating the perpetual licence, which is what we have currently and will stop being available in November with the new subscription. If I do not move to the subscription model, I can continue to use my current version of PHPStorm, in perpetuity.
However, I cannot subscribe under the new terms, and keep using the software if I decide to stop subscribing. Earlier in this thread you suggested that we could subscribe for a month and keep using the software afterwards. This is incorrect. Once you stop subscribing, you lose the rights to use the software