Is this an intermediate lesson or an advanced lesson? The answer is it can be either; it just depends on how fast you play it. So long as you can play DhiraDhira, you can attempt this rela.
When I was in Delhi I was taught a simple DhiraDhira exercise: DhiraDhira DhiraDhira kitataka kitataka. I practiced it but at the time it wasn't readily obvious that such a simple passage had much musical potential; rather, it looked like the sort of exercise meant to strengthen the hand only. Then I heard Pandit Anokhelal Mishra play it.
Pandit Anokhelal Mishra was a very great Tabla player of the Benares Gharana. I've heard many stories about him from my gurus; the stories both inspire and intimidate. He supposedly died of gangrene in his legs, the result of sitting cross-legged for hours and hours of practice (obsessive-compulsive?). They also say that he missed his daughter's funeral for practicing. Whether those stories are actually true or not, he certainly garnered tremendous respect from his peers, not least of all Ustad Ahmedjaan Thirakwa. There's a story where Thirakwa forgot a gift from Anokhelal on the train: a walking stick. Upon realizing his mistake, to the dismay of the concert organizers, Thirakwa refused to leave the train station until the walking stick was returned by an incoming train many hours later.
In any case, this remarkable fluency of Kitataka and DhiraDhira seems to have been one of the hallmarks of Anokhelal's playing, and it's well represented in this rela. What's also remarkable is that the rela kicks of with a series of six Dhiras in a row - not for the faint of heart. There is a lovely back-and-forth between bhari and khali phrases at the end of variation 2, after which the rela quickly reduces in size until it becomes a rapid-fire exchange between DhiraDhira and kitataka phrases. All in all, it's a fairly self-explanatory development. All it takes is practice, practice, practice! But don't lose your legs over it. :)
Enjoy!
-Chaz