Doesnt happen all the time. Just light puff randomly on light acceleration sometimes be it rolling or standing start .

I look through the passenger side mirror.

Tuner said totally normal on old school diesel especially before boost comes on to even out the AFR.
He said pump and injectors in excellent condition

Just would like other peoples opinions.

Yes smoke is black.

Night time through cars heads lights behind you. You can see more but I think the headlights exaggerate it abit.