Not really, a sharpening filter just does something different. Nvidia also released their own sharpening filter which ended up being better than Radeon image sharpening, if you believe Hardware Unboxed videos.
Also, the point is that DLSS implemented now is now working so well that any sharpening filter doesn't even come close. When 1440p DLSS provides indistinguishable image quality from native 4k, it's done it's job.
This is what DLSS should have been in the first place and not rushed. The other drawback is we'll see this new DLSS "2.0" only in newer games, so that stain from Battlefield 5 will remain.