I work at a 20-year-old mid-sized SaaS company. As long as the company has been around, product managers have longed for more engineers and strategies for engineers to ship features faster. As of around February, those same product managers across the org are complaining that they can't keep up with the pace at which engineers are shipping their features. This isn't just lines of code. This is the entire company trying to figure out how to help the PMs because engineers suddenly stopped being the bottleneck.
I don't know about 10x, but this could only happen if PMs suddenly got really lazy or the engineers actually got at least 1.5x faster. My gut says it's way more because we're now also consistently up to date on our dependencies and completing massive refactors we were putting off for years.
There are lots of reasons this could be the case. Quality suddenly changed, the nature of the work changed, engineers leveled up... But for this to have happened consistently across a bunch of engineering teams is quite the coincidence if not this one thing we are all talking about.