Breakdown of proteins is dependent on enzymes secreted by pancreas and at the brush border of the small intestine.
Absorption of the aminoacids is dependent mostly on Na (sodium) cotransport, and some specific aminoacid receptors & endocytosis. Absorption of the aa will be in the small intestine. Colon is where most of the bacteria is and the colon's role is not absorb proteins, but water and electrolytes.
cant find anything that points out some major (wide-spread) issues inhibiting aa uptake due to tea causing malabsorption or malnutrition.
then again, i imagine you're taking excess protein over the daily required (that would keep the body from using its own proteins), so even if tea even complexes with some protein/aa, overall you'll have more than enough to absorb.
(i was just reading that there still is controversy if athletes really need more protein (>0.8g/kg/day) or not, the bodybuilding side saying of course there is need. This author tho pointed out that something like after about 12 days of same intensity exercise the need for protein stabilizes because the body becomes more efficient in utilization, unless you raise the exercise intensity again)
a couple months back i was working out more intently and gained some muscle fiber so i can lift more than 1 book at a time, but i still drank lots of tea around the day. i dont take supplements, but i do eat more meat (excuse for bbq
). however, i think most of the gain was when i was doing the weights regularly (almost everyday, except weekend)