I wouldn't believe it unless I had tried it.
I have several BS Pulse Flex 2i boxes around the house one of which connected via ethernet. One day when checking my network I noticed that this connection was specified at only 100Mbits even though the port was set to 1Gbits. And I remember that I had read in the specs of the PulseFlex that Gigabit was supported. See below (and it still is, I took the screenshot just now):
View attachment 28424
So I turned to the BS support for clarification and they confirmed that only 100Mbits were supported and that the product description was faulty. BTW that was 8 months ago.