not sure about the GAE and it's inlet as I've not taken it apart yet for the PS transplant. I've heard many devices with those filters and they are not terribly effective at blocking all the high frequency noise and the associated harmonics. Look at it on a scope, they can be really nasty. If you like what you're hearing, I'm glad for you. I literally stopped looking at the Aurender W20 when I found out it contained a SMPS, it's a deal breaker for me unless I can rip it out like I did with my Mac Mini.
The only filters that I have found thus far to effectively combat the nastiness of SMPS's are the Blue Circle Outposts which were designed by Gilbert Young specifically for the garbage that SMPS's spew and the iFi AC iPurifier. Even my PS Audio P10/P5 and Monarchy AC Regenerators can't protect against the bad influence of a SMPS in the system.
Concerning your Devialet, you really don't have a way of comparing what it would sound like with a linear. Note that digital amp manufactures will sometimes have a reference line and they almost always use a linear power supply for the amplifier. Acoustic Reality did it with the Thaumaturges, H2O used linear power supplies in his higher end switching amps even Wyred 4 Sounds Nextgen amplifier is/was slated to make use of a linear power supply. Mark Levinson used a linear for the no. 53 switching amplifier, even the new Technics reference switching amplifier uses a huge linear power supply. These manufacturers KNOW they sound superior but most of the time "cost" wins and then comes the marketing lies to sell it all to us, the consumer. I've designed enough power supplies to know better.
I was going to purchase the Halcro DM8 that's on Agon or was just recently for sale as I've always wanted to try that piece. Found out it has a SMPS, no go.