Book of sunnah?

His mubaarak hair was slightly twisted. If
his hair became parted naturally in the middle he left it so, otherwise he
did not habitually make an effort to part his hair in the middle. (This is
a more accepted translation. ,A question may arise that Sayyidina
Rasulullah Sallallahu 'Alayhi Wasallam habitually parted his hair as
stated in the ahaadifi. The 'ulama say that this is in the early periodswhere Sayyidina Rasulullah zallallahu 'Alayhi Wasallam did not make
an effort to do so. According to this humble servant, the answer to this
is a bit difficult, because it was the principle of Sayyidina Rasulullah
Sallallahu 'Alayhi Wasallam to oppose the ways of the non-believers,
and agree to the ways of the Ahlul-Kitaab, he did not part his hair in the
middle. For this reason, according to some 'ulama, the best translation
will be that he only parted his hair in the middle if it could be easily
done, and when this could not be done easily, and a comb etc. was
needed to do it, then he did not part his hair in the middle. Occasionally
he used to part his hair in the middle with a comb etc. When the hair
of Rasulullah Sallallahu 'Alayhi Wasallam was abundant, it use to pass
over his ear-lobes)

Pg. No. 13 view inline

I don't get it properly. would it be wrong to say it's sunnah to part the hair in the middle?