Is the chain tension on 2018 correct

[Larsa]

If I look in the user guide to Gas Gas 2018.
Page 56
1. motorcycle without load and with the side stand out: There should be a space
of 30 ~ 36 mm. between the chain and the swingarm in the rear area of the
chain guide. you can check with your fngers, but without overly forcing it.
2. Loosen the rear axle nut (1).
3. find the point of maximum tension on the chain.
4. using the nuts (2) of the tensioner, align the alignment of the chain on both
ends of the swingarm using the notches on the swingarm and the lugs on
the adjusters.
5. Tighten the nuts (2).
6. Tighten the nut (1).
7. check again at the point of maximum tension and re-adjust it if necessary.
Is this mesurment correct 30-36mm?
If I sit on the saddle and feel the chain, the chain is buckled like a violin string. Is this correct?