Why not "those"?
It would have to be TAMTĚCH
Is it right that there has no "r" to be spoken in "čtyř"? At least I don't hear one.
In čtyř there is č t i/y and ř, no r.
Okay, I said it the wrong way. So, "ř" is spoken like (sorry, that might sound german) "rsch", isn't it? So I wondered where the "r" part of "ř" went to (until now where I suddenly hear it. So sorry for interrupting).
There is no part, ř is a single sound. Please try to listen to some real people recordings at forvo.com.