Yes because they have autopilots fitted so are legal to be flown Single pilot IFR public transport.
The Blue lot have to have safety pilots onboard due to the lack of autopilots. And they don't get to log a single hour.
The regs involved with single pilot ops are in some ways rather complicated, if we are lucky someone like CRX who really does know his stuff on the subject will come along and preach chapter and verse. I have worked for company's who run both single pilot and multicrew ops but only on the multicrew side of things. The regulations have so many restrictions/exceptions depending if its IFR/VFR, public transport, air ambulance, surveying etc etc. And each company tends to have its own agreements with the CAA about what they are allowed to do.
To be honest I am sure if the regulator could have done it, they would have banned commercial single pilot ops years ago.