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Not at a fixed price (ie, true "miles" redemption). They only offer it for their own airline because that's the only place where they don't have to actually pay anything to give you an award seat (ie, they're giving you what they project to be "excess capacity"). With partner awards, it's not "free" to the airline the way it is with its own awards.

At variable prices, revenue-redemption rewards programs (especially bank-based airline-independent ones) can get you any seat that anyone is willing to sell on any airline, but then the higher the cost of the seat in money, the higher the cost of the seat in those points, no way around it.

So you never should simply ask just whether there's award availability. You should also ask at what cost. Because in some cases, especially with revenue-based rewards, there is always award availability (as long as there are seats for sale*) but the cost can skyrocket to the point where most people wouldn't consider it a good value and where most people wouldn't have enough of those points to redeem for that anyway**.

* Btw, here's an interesting difference between sold seats and "anytime" award seats. "Anytime" seats are viewed as the last seat on the plane, but there are rare cases (typically in lower cabins) where "anytime" may not be available but there is still a seat left for sale. This happens when the airline is willing to "overbook" the cabin (on multi-cabin planes, this may happen because the next cabin up is lightly filled and they know they'll be able to "roll" some passengers into the next cabin if need be). But they're not wiling to "overbook" using "anytime" award seats, just with sold seats.

** Unless you're earning some of your points in non-linear ways (ie, through bonuses not proportional to spend), most revenue-based redemption methods of getting to "anytime" seats work out no better than typical "cashback" credit card returns, sometimes even worse. Revenue-based redemption offers the hype of "you can always redeem for a reward", but the reality is that it's never a better value than paying cash for one flight than another flight, because it's always proportional to paying cash. The beauty of "true" miles is that it's not at all proportional to cash, and so sometimes you can find great value (though other times of course there's no availability except with "anytime" awards perhaps).