Polk Magnifi Mini No Wifi 5 GHZ AC support

I bought a Polk magnifi mini soundbar. On the Polk Poland website, he writes that it supports the 802.11a / b / g / n / AC wifi frequency - 2.4 GHz and 5 GHz. So I tried to connect to my wifi network, which I have set to 5 GHZ and only AC protocol. Unfortunately, I could not connect the soundbar to the network, in the Google Home application a message pops up that it could not be connected to the wifi, the LED on the soundbar is still flashing, the 2.4 GHZ soundbar has connected, but it did not give me peace at 5 GHZ goes, so I switched the router to 5 GHZ but with the a + n + ac option and the soundba connected seamlessly, so there is a problem with AC support. On the FCC website I saw in the pictures what the wifi module has a polk audio magnifi mini and this is Mediatek MT7632UN, which according to the specification DOES NOT support AC networks, and yet the polk audio page says that it supports AC 802.11a / b / g / n / AC - 2.4 GHz and 5 GHz. This is a clear misleading consumer.