Rican, 5x5 IS volume training, man. Today, people get confused about the true definition of volume, much like they fuck up what intensity actually means or is supposed to mean. Intensity is % of 1 rep max, end of story. Not some abstract way to tire yourself out.
Volume, is total workload. You take weight and multiply by reps and then multiply by sets for workload, that's volume. It's very black and white and very easy to guage progress by your constants and variables. If you run 5x5 sets of straight weight at 85% on the squat, that is a lot of freaking volume, 6x5 or 7x5 makes it even more. Think German volume training, the Smolov/Russian squat program, and 5x5. Volume isn't cramming 10lbs of shit in a 5lb bag. Doing 10x10 on the squat is more volume in 1 day than somebody does in an entire month by working up to 1 set of 8 in the squat and doing 57 sets of leg presses, leg curls, leg extensions, machine hack squats, and who knows what else other machine in the gym.
Volume is just workload.....reasonable workload, don't check common sense at the door. 5x5 at 85% on the bench is more volume than 100 sets of 100 with 2.5lb dumbells, lol....but you know what I mean, bro.
Total work is what is meant by volume, not the amount of useless exercises you can conjure up.