Is this supposed to be a defense?
Yes. It's incredibly hypocritical to complain about Kermit "sounding wrong" and then gush over David Tennant's Scrooge McDuck, which sounds nothing like Alan Young.
I'm pretty sure those are all meant to be new iterations of those characters. Kermit is canonically still Kermit, he's not a reboot.
I've heard this "no, no, it's not THAT version of
[CHARACTER], it's a NEW version!" excuse before, but it doesn't hold much water.
For one thing, the
Jetsons movie where Tiffany did Judy wasn't a reboot. The original plan was for Janet Waldo to voice Judy again, but studio executives forced them to replace her with Tiffany because they thought it would sell more tickets.
And in a lot of these reboots, there's still other characters who still sound like themselves. The
DuckTales reboot still had Tony Anselmo as Donald (and even then they did episodes where some sort of device was used to give him Don Cheadle's voice). George, Jane, Astro, etc. all still sounded like themselves in
The Jetsons Movie. And even if the character designs are slightly different, they generally aren't so different that it feels like an entirely new character, so in my opinion the voices still stand out. Plus, most Muppets productions have their own continuity anyway, so you can still make the claim that they're not supposed to be the same characters per say.
The fact remains, even if not every project featuring Scrooge was in the same continuity as
DuckTales, he still had a consistent voice for years since then. We know what Scrooge McDuck, Garfield, etc. sound like and it's not David Tennant, Chris Pratt etc.
Plus, at least Matt Vogel is TRYING to sound like Kermit. That's more than you can say for Chris Pratt.