Yes! All the ratings from this outbreak are appropriate, and this is how it should be done. If a reasonably well-built house is leveled or slabbed, and there aren't any glaring contextual discrepancies, there isn't really any good reason not to go EF4. The EF4 rating for Clarksville, TX also is a good reminder that if there is enough contextual support, anchor bolts are not absolutely a necessity for an EF4-rated house. It's also good they bumped Cason, TX and New Boston, TX up to EF3. Again, if a site-built house or business is leveled, the minimum rating that should be applied is low-end EF3, not EF2.
Only comment I want to make is that regarding the EF4-rated house from the Powderly, TX tornado, is that the upper portion of the house seems to be semi-intact, as another user pointed out. This gives me some Newnan, GA vibes, but this one doesn't seem to have the glaring contextual discrepancies that Newnan did, and the overall intensity of the damage in Powderly does seem worse than Newnan. So the conclusion is: Marginal EF4 seems appropriate, and NWS Shreveport has avoided falling into the "coming up with stupid reasons to keep the rating lower" trap. Kudos to them!