To summarize, so people don't need to reread a 25 page thread:
Fur continues to argue that since there is connective tissue of varying amounts in hamburger, LFBT does not change the texture of the burger beyond the normal range of variability.
Fur incorrectly argued that heat was used to separate the 'trim' from the bone. It is not. Heat is used to liquify the fat of the waste trim then a centrifuge is used to separate the fat from the trim used to make LFTB. When showed the error, he shifted his argument to claim it didn't matter.
Incorrectly believing the heat was used to remove LFTB from the bone, Fur initially argued that the trim needed additional processing simply because it was close to the bone, but was otherwise the same as the rest of the trim used to make hamburger. The two kinds of trim are not the same. The trim used to make LFTB is waste trim (previously used only in pet food), not because it was on the floor or dirty or needed additional processing to remove it from the bone, but rather it was waste trim because it was of such poor quality with very little red meat in it and a whole lot of other tissues.
The analysis of the LFTB showed it had ~70% fibrous protein compared to ~30% fibrous protein in ground chuck. This waste trim comes from tissues that are further from the muscle, not simply closer to the bones. Actually, a good portion of the waste trim is closer to the hide, not just closer to the bone.
Connective tissue is also protein, but it is not meat which is a very different protein. An obvious illustration of this is comparing eating ground up tendons to eating a ground up steak. Obviously they are not the same but both are proteins.
The beef industry has been taking the waste trim that is of very poor quality because it has so little meat in it, removing the fat with low heat and a centrifuge, then using it as an additive to hamburger to lower the overall fat content. Rather than grinding up a leaner cut of meat, the processer simply adds more protein but not more meat. That connective tissue protein is not the same texture as muscle meat protein. And no matter what the range of connective tissue volume in regular hamburger, adding LFTB which is almost all connective tissue, noticeably changes the hamburger well beyond the range of connective tissue proportions before the industry started using LFTB.