Nope - Orbi does AC3000... which "theoretically" can go to ~3Gbps (if you max out all bands simultaneously). That's well beyond DOCSIS 3.0. 3.1 can currently go to 10Gbps.
In a more "typical" usage (only using the 5GHz bands)... two Orbi's (base and satellite) can serve up ~1.7Gbps to two clients (one connected to each Orbi). That's still beyond DOCSIS 3.0.
Then there is the fact that even at DOCSIS 3.0 speeds DOCSIS 3.1 is much more efficient (both bandwidth and energy wise)... so many cable systems are going to switch to 3.1 just for that alone...
probably decided it wasn't worth the boundary improvement until 'ax' comes out. Guessing they are currently working on a 3.1+ax orbi using draft standard chipsets they will release next year and are considering this their stepping stone proof of concept product. I will be one of the day one customers if they do in fact release a 3.1+ax router next year.