Some oils don't carry various certifications simply because they are not tested to that standard. It does not mean they wouldn't pass that test.
It can be that the specific test is geared towards a market the oil wasn't intended for, or it can be a marketing issue .... They don't want their cheap diesel oils competing with their expensive motorcycle oils ...
There is nothing special about a motorcycle engine, but most do have two specific demands. The oil has to cope with the shear stresses in the gearbox is the first. This means that many car-specific oils (Castrol GTX, etc) are not suitable. They achieve their multigrade rating by using a light base oil, then adding viscosity enhancers. Those are long-chain hydrocarbons that raise the viscosity, but get broken down quickly in a gearbox. This also means that you can use them in a pinch, but change them soon.
A diesel engine runs well over 20:1 compression ration. The shock load on the main bearings rules out the viscosity enhancers, so diesel multigrades are made by blending base-weight oils. Nothing to break down, perfect for us.
The second issue is the clutch. If you ride a BMW with a dry clutch, you can stop here.
For the rest of us .... Friction modifiers, helpful in engine bearings, are less helpful in places you need friction ... ie, our clutches. It is thought that those compounds may cause wet clutches to slip. I have never seen any evidence of this, maybe because few have tried it, but avoiding them does seem sensible.
The rest of an oil's composition is minor, and usually related to the additives they put in for cleaning, etc.
Shell Rotella T (and others), are bog-standard Heavy Duty Diesel Engine Oils that work perfectly well in our FJR1300 engines. These oils are not necessarily rated for use in a motorcycle because they haven't been tested in one. Well, they have in mine, but apparently Shell doesn't count that
So there you have it. It's your bike, use whatever oil you like you will never hear me complain or criticize, but if people ask (and believe me, they keep asking), I will tell them what I use, and why.
The rest is up to you.