Assuming you have the L76 in stock form with auto trans. - i.e. DOD hardware present and factory DOD disabled. However if it is the manual with no DOD hardware, most of the following will still be relevant.
My understanding is that there shouldn't be any specific issue with the DOD lifters fitted to cyl's 1, 7, 4 & 6. The lifters are permanently in the locked position and therefore there should be no opportunity for mistimed actuation of locking pins to cause damage or sticking (compressed) springs.
So if a lifter tick is evident it could be a problem on the non DOD lifters
or the DOD lifters - possibly unlikely to be directly linked to the DOD system itself.
Many posts on many forums seem to indicate that hydraulic lifters are inherently noisy - whether on a DOD engine or a non DOD engine. This also suggests that the problem is not necessarily linked to a poorly implemented DOD system. Also to paraphrase grasshopper645 - others have replaced lifters (whether DOD or non DOD) and the lifter noise persists. It therefore seems illogical and unnecessary to simply go for a DOD delete (where cams etc are found to be in good order). If the DOD ain't broke then removing it will not fix the problem.
Thanks to shane_3800 for providing the info on camshaft bearings and oil pressure. Another good post indicating that simply doing a DOD delete might be a waste of time and money.
Check out the following youtube clip - Melling Tech Tips JB-7011, Nov 12, 2018.
Notwithstanding the above it seems that GMH fitted revised (upgraded?) lifters over time. First with Delphi 1 lifters and for the L77 VF series 1 with Delphi 2 lifters. It seems likely that the revised lifters were intended to improve on the performance of the original L76 lifters. That being the case, perhaps replacing all L76 lifters with newer Delphi 1 or 2 lifters would be a benefit? I can't say whether the Delphi 1 or 2 lifters would be a drop in replacement or whether other mod's would be required - machining of lifter bores, different push rods, cam swap etc? Perhaps worth noting is that (as far as I am aware) the later L77 motors used 16 DOD lifters - there being no difference between lifters used on DOD cylinders and non DOD cylinders. Possibly your friendly GMH dealership would be able to shed some light on the matter?
Doubtless many have had lifters replaced and if any of you can provide feedback on the issues and questions noted above it would be really good to hear from you, for the benefit of all.