AFAIK no one recently claimed level 4 with a safety driver was decades away, and I was working on self driving until a few months ago so I was kinda "plugged" into the news. A handful of serious companies have plans and funding to deploy L4 taxi fleets or L4 features to consumer cars in 4/5 years.

There's no commercial value at L4 whatsoever if you still pay a safety driver. It's usually even more expensive per hour than a normal human driver and the cars don't work under adverse weather conditions.