Putthujjanas can achieve Jhanas too. Jhanas are not limited to Ariyapuggalas only.
So it is no surprise at all that Cakkavati Maharaja can achieve it. But the Jhanas here doesn't contribute to the escape from Samsara aka Nibbana.
Achieving Jhanas don't really automatically mean that person is a holy person in Buddhasasana. He/she can be very powerful in Jhanas, wielding various supernormal powers, peaceful etc. But this person will still subject to birth, ageing and death, as long as he/she did not abandon fetters such as Sakkaya-Ditthi, Vicikkiccha, etc.
"Namo sattannaṁ sammāsambuddhānanti"
This refers to the seven Sammasambuddhas. They are:
Vipassi,
Sikhi,
Vessabhu,
Kakusandha,
Konagamana,
Kassapa, and
Gotama. They were all Sammasambuddha, supreme enlightened ones, all with same abilities with Supreme Enlightenment.
The present Sammasambuddha (Gotama) speaks about those past Sammasambuddhas in Mahapadana Sutta.
http://www.suttas.com/dn-14-mahapadana- ... neage.html
"Chakras" concept doesn't exists in Buddha Sasana. It is found in either Hindu culture or Japanese anime eg: Naruto.