Is apple still slowing down older phones?

Apple NEVER slowed down older phones arbitrarily. There was a problem with phones that had weak batteries, that would abruptly shut down if you put a heavy load on them. So in 2017 they added a FEATURE that would slow down the CPU in phones with weak batteries to prevent them from shutting down when in the middle of a game or call. They made the mistake of not publicizing this, and some barroom lawyers spread the conspiracy theory that Apple slowed down phones so people would have to buy new ones. It was never the case, and with the next iOS release Apple added a switch so you could turn off this feature, and let your phone crash instead. They also created a program that would allow you to replace your worn out battery for free if it was under 80% capacity, or for $29 if you just wanted to replace it. This mistake of failing to announce the feature has now cost Apple a half billion $. While they did announce it, they did it too late. Here is the history of why Apple slowed down devices that had weak batteries, to prevent the device from shutting down in the middle of something important that you were doing—>https://www.cnet.com/news/apple-is-slowing-down-older-iphones-batteries-faq/

And here is Apple’s direct explanation—>iPhone Battery and Performance - Apple Support

See specifically the section on “Preventing unexpected shutdowns."

However, you might still be eligible for $25 when they finally settle the class action suit—>Apple Slowdown tentative settlement detai… - Apple Community

Probably won’t be any time soon, however, because pretty much all courts are shut down for the duration.

But Was The iPhone 7 Plus Affected And Is It Still, If it is still is there a way to toggle it?

At that time, yes. iPhone 7s were managed in a similar way.

Please read the article linked by Lawrence as it will answer your questions.

The iPhone 7 was affected, but ONLY IF IT HAD A WEAK BATTERY, AND THE PROBLM COULD BE EASILY FIXED BY CHANGING THE BATTERY. Sorry about the shouting, but apparently you either didn’t read or didn’t understand my previous post.