I did not find any reading in that strength training link that suggested 50 reps is too high. Please tell me more about how volume training is not effective.

"too high" and "ineffective" are relative terms. If your goal is muscular endurance, burning calories, and lean mass GVT may be effective. However, so far as I know, it's not conducive to strength, or as far as I know it, significant mass gains. I could be wrong though, as I've never wanted to try it. I always hear about people hurting themselves or regretting it. Regardless, your mention of GVT is totally irrelevant, because OP is only doing half the reps, at probably 10%+ less weight than he would if he was on GVT, so, uh, yeah.

It's pretty rudimentary weightlifting knowledge that high weight/low rep workouts result in mass/strength gains, not high repetition routines, which 5x10@135 is, especially when 135 is likely 50% or less of the 1RM. I don't know what you're arguing with me about, other than I may have loosely used the term aerobic to emphasize the fact that his set of 5x10 at 135 was obviously not doing much.

My whole point wasn't that consistency does not impact soreness. My point was its not unusual that he should be pretty sore considering he went heavy when he was accustomed to volume (regardless if the weights were too light in the first place). Heavy deads will hurt your back for awhile if you aren't consistent with them.

Ok. So you basically agreed with me? Irregular training routine causes soreness? OP is talking about barely being able to lift the bar into the rack, and struggling to stand up from sitting. I'm gonna go ahead and say that soreness exceeds typical new workout soreness. So, uh yeah.