All the news we have are about f(x)tec (slowly) working through existing (pre-)orders that have in part been pending for several years. This should not prevent you from ordering a Pro1-X. As far as we know, f(x)tec finally always delivers. However, you should not count on getting you phone very soon.
Also note that the Pro1 and Pro1-X do not "support" Linux in the way the PinePhone does. While some progress in mainlining the original Pro1 (the SD-835 variant) has been made, all existing GNU/Linux OSes for the Pro1/Pro1X that can at least remotely qualify as daily-drivers (SailfishOS, Ubun