Where's the source? Didn't you say FTH4 was going to be open source?

FTH will never be open source.

Didn't it previously say in the new docs that it was going to be open source?

nope

The page is no longer available, but it still shows up in search engines that it used to say:Open source — FreeToastHost 4"FreeToastHost 4 is built openly on GitHub under AGPL-3.0 and is being developed to be donated to the toastmastersclubs.org …"Is this not what was written before?

That was a faker site, trying to capture toastmasters information.