[TF/P]_x is a ratio of concentrations, alone it can't say anything about something being reabsorbed more or less quickly than water because there's a time dimension to the question that isn't captured by the ratio.
What this card is trying to test is how this ratio changes as we move along some part of the nephron, this equates to this ratio either falling, rising or staying the same.
Another way to fix this, is to specify e.g. "at the end of the PCT", where a peek at the ratio will reveal reabsorption rates compared to water. I opted against this fix, though, because this is a general concept and the ratio will move in different directions in different segments of the nephron, depending on if water or solute is being reabsorbed.
There are a few cards of this nature and I propose we fix all of them.