Yes, Osta does bind to the AR receptors leaving test floating around whihc is why you need an AI, NOT a SERM(Clomid, Nolva). They are two completely different things. An AI is something like Arimistane, Formestane, Exemestane, PES ERASE, etc...these are suicide AI's or SSAI's, which bind irreversibly to the aromatase enzymes, thereby preventing testosterone from being converted.
AI's also increase testosterone via suppression of the negative feedback loop created by Estrogen which is the hormonal marker the body uses to check the androgen levels of the body, similar to how the body uses leucine as the marker for checking the amino acid level of the body. With little to no estrogen, the body believes there is not enough testosterone floating around, so it ramps up production, since the only way men normally get estrogen is to convert testosterone. This is why plastics, pesticides and other environmental toxins that are xenoestrogens(strong estrogen like molecules that bind much stronger than normal estrogen does to the receptor) are wreaking havoc on male testosterone levels, which have on average fallen over 20% from the 1970's. These extraneous estrogens bind to the receptors, the body believes there is too much testosterone being produced and stops making it, and what makes it worse is the estrogen controls the production of Sex Hormone Binding Globule(SHBG), which seeks out and binds to testosterone, rendering it inactive. The higher the estrogen level, the more SHBG is produced(high estrogen fools the body into thinking too much testosterone is being produced).
The best part about SSAI's is that after discontinuing them, there is no estrogen rebound, since the enzymes are only slowly remade by the body. So once you stop them, your estrogen levels will slowly rebound back to normal levels, but not above. So that is why you only need to be on an AI, not a SERM, for a few weeks after stopping Ostarine to let the body get it out of the system, bring back T levels from any minor suppression and then you are back to normal...