Their de facto stance is that the Taiwanese government is sovereign over the island, but they formally accept that the PRC is the government of China.
It’s a careful line between ensuring the continued de facto independence of their key ally, without inducing the inevitable temper tantrum from China of formally treating them as independent.
They don’t acknowledge Taiwan “sovereignty” because they support the claim that the legitimate government of all of China is the one in Taiwan.
No, they do not.
Their de facto stance is that the Taiwanese government is sovereign over the island, but they formally accept that the PRC is the government of China.
It’s a careful line between ensuring the continued de facto independence of their key ally, without inducing the inevitable temper tantrum from China of formally treating them as independent.