Not true. IBD is commonly seen in the pedi GI clinic given that it often presents in the 15-25yo range.
I'm a MS4 and just did a pedi GI rotation - at my hospital the GI docs had 1 day a week of procedures. This day involved only upper and lower scopes. Many upper scopes to work-up celiac disease. The peds procedures seemed less interesting than adult GI procedures because many if not most of the cases were normal by visualization. Pedi GI docs can also put in g-tubes, however I never saw this, for one because the pedi surgeons take some of these cases. GI docs in theory can do liver biopsies, but this is a very rare thing. Another procedure I saw was placing a pH probe, which we often got consulted to do in the NICU. Reading the results of capsule endoscopy is another. I bet there are a few procedures related to manometry but I can't comment on that.
If you see yourself liking small less frequent procedures, GI could be a great fit. If you love GI and really like procedures, adult GI + ERCP is a better fit. If your primary interest is procedures, go with something surgical or anesthesia.