The church can be accused of false advertising when it says it welcomes all but makes it impossible for some to join or stay or participate.
If the church is worried about numbers and is doing anything to grow, including making false claims, then it needs to get over it. Just admit you don't welcome short people. Don't worry! There's plenty of tall people out there who don't believe in shortness and will join your exclusive group.
Just look at Starbucks on the one hand who supports same-sex marriage and Chick-fil-A on the other hand who opposes it. Both have taken a stand and both are doing just fine.
So take a stand! Be honest! Raise the knob and keep people out you don't want in.