He could have been using it through studio monitors.
Good lord not heavy. I have a 500 and an 800 W bass heads that weigh 4.5 and about 8 lbs respectively. My main cab is a 400W 1x15 that weighs 39 lbs. I frequently have a lighter easier load in than guitar players, sometimes there’s even a good house amp. If I need more, I add another 400W 50ish lb matching 2x10. It’s more and more common to see lightweight bass gear.@greco works has it that Geddy went preamp - pa -monitors.
I’m starting to do this as well. Guarantees that you’ll hear it if the FOH sound is lacking. Bass amps are big and heavy. And I laid off my butler. He used to carry me and my gear to and from my car.
Now I have to walk. Can you believe it??