The IDE is part of the old architecture and doesn’t have all the information about devices added with edge drivers. Anything that says “placeholder“ there may have an accurate or incomplete information, but it should still function fine. And even though it says “cloud“ if it’s using an edge driver it is local. It’s just the IDE that is wrong. so none of that should be an issue for you.
It is surprising that you had any devices still add with the DTH instead of a placeholder, though, if they really are all the same model (and have the same fingerprint) 
Also note that it is important that you not try to make changes through the IDE to a device that is using “placeholder“ – – that could break the integration altogether. 
As far as devices being slower now… is it possible that one of the devices that didn’t show “placeholder“ was acting as an important repeater in your system?
And here’s some more information on the various utilities that are available for the new architecture so far.
FAQ: I have no idea what Edge is. Is that a new developer tool? (2022)
I believe you will still be able to do a Z wave exclude through the app, but someone else will have to say for sure.