netgear raxe500 6e with iphone 15 pro max?

What needs to be determined are the regulations in Taiwan for the 6GHz band. For example, if the AP tries to use a channel that is not allowed in a different country, then devices there, will not see the SSID until the AP switches to a supported channel.

Beyond that, if in a region where none of the channels are allowed, then once the device detects beacons indicating a different region, the device may stop transmitting on the disallowed frequencies to comply with local laws. For me, it is hard to determine exactly how Netgear implemented their compliance functions as device makers aren't limited on how they go about complying, as long as they ensure that a device when leaving the jurisdiction of one country, and then entering another, has some way of avoiding any major violations of the broadcast laws of that country.

The challenge is that the iphone will have its own implementations of compliance.

The WiFi alliance has not updated their page to provide details on Taiwan https://www.wi-fi.org/countries-enabling-wi-fi-in-6-ghz-wi-fi-6e

Beyond that, other sites have mixed messaged surrounding if 6GHz has been officially allowed, and in every case, no one is mentioning which frequencies within the band are allowed.

For example, if they have officially allowed it, but only a small segment of the 6GHz band, then you would have to ensure that the RAXE500 was set to use a channel in the allowed frequency before the RF transmitter will actually enable itself. (if it used one of those automated beacon approaches to regional compliance.