-Possibly.. but probably not...here's why...
I don't personally think upgrading the SPL to 2.6 had anything at all to do with it when we unbranded our devices. You have to look at it this way. SPL 2.6 was pushed out to very few Titans because of a Zune glitch when HTC pushed out SPL 2.5. Some unbranded devices that were running 2.5 already from the first HTC update could upgrade to DFTs SPL and HSPL without a problem - without having to upgrade to SPL 2.6.
However, I cannot relate to what I just said, as I did in fact upgrade to 2.6 after I debranded my device -in which everything went fine and dandy.
.....................................................
BUT...
All unbranded devices received a bootloader update back in Feb. causing the SPL to upgrade to 2.5. All AT&T Titans did not receive this update because ... ATT fails at life.
(IMO)-Going off by assumption here... (and don't take this seriously as I am just spewing out words AND this IS NOT anything against the DFT group -as I would sell every drop of blood of mine just to have them around any day)...that DFTs modified SPL was written as an exploit for only SPLs 2.5/2.6...which they "probably" or "could have" assumed the ATT devices had been upgraded already.
Which was why an ATT Titan, unbranded to a Euro rom w/ SPL 2.5/2.6 could install DFT's 2.5 SPL+HSPL without a hitch.
-OR-another scenario...As Tachi has said...
The 1.10 SPL just caused a massive glitch when someone tried to upgrade to DFTs 2.5 SPL.