I took a closer look, when I removed the front tire today - a few weeks earlier than planned.
I came to the conclusion that the date stamp is genuine and has not been tampered with or altered at all.
It´s indeed just Kenda style/quality.
So everything is in the green aerea here.
Also checked the Kenda tire for out of round before I took it off the rim, but it was all perfectly fine laterally and radially.
Didn´t find any cracks or fissures either.
As long as you are riding in dry conditions this tire is pretty good and has incredible good milage.
Nevertheless would not buy it again.
Sorry for upsetting the apple cart.