Not necessarily -- if sh1t teams throw in crosses because they don't have the quality to build more intricate attacks, then it follows that the quality of said crosses will be worse; what's more, sh1t teams will not commit as many players into the box to attack these crosses or benefit from the defensive chaos that a cross can cause via half-clearances etc.
A full-back lobbing in a hopeful ball to the big man and one or two other attackers (sh1t team crosses) isn't the same as precision from a player like Eriksen, or a quality full-back getting to the by-line and putting the ball into a dangerous area where 4 or 5 attacking players can potentially score (good team crosses). Yet in the stats, these all get lumped together to produce an overall xG, which kinda hides the effectiveness of crossing for a quality side like ourselves.
In that case, you can just look at the goals we score, the wing play of our full-backs etc. to see that crossing, for a quality side like us, can be a very good strategy with a better xG than the overall stats for the league suggest.