The alternatives are also rated at this temperature.
Yes, they won't be suitable for boiling wort however, when do you actually transfer boiling wort? The hottest part of your system will be the outlet of the brew kettle. the valve will be open after you whirlpool the wort and are transferring it to the heat exchanger.
You probably whirlpooled for around 5 mins and let it stand for another 5 mins. anyway, my point is that the wort is not at 212 when it comes out of the kettle. It's probably dropped by a good 15 degrees during this time.
That's still right on the upper edge of these valve's operating parameters but much better than a boiling transfer operation.