Far from it; Khabib merely knows how to use the cage to his advantage, like most cage fighters do, by the way. Khabib is an elite level grappler, he didn't win ADCC by coincidence. The result wouldn't have been any different without a cage.
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It's very hard to guillotine someone if you can't control the hips; Khabib's escape was by the book, he climbed over the knee and relieved pressure. Now, Poirier could've gone to an Anaconda- or D'Arce choke after that, but that requires you to be mentally on point. Poirier was burnt, he was done. That guillotine was his last resort and he obviously wanted that to work. When Khabib escaped he gave Poirier the final moral blow that completely crushed an already beaten man.
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He sure has heart. I'm just not sure the rest is on par.
Unless you're an experienced ground fighter yourself. Jiu Jitsu/Sambo is going to beat Khabib and nothing else, which is why Tibau gave Khabib such a damn hard time.
Hope I'll get the chance to roll with Khabib one day.