Monte Cazazza gave Industrial Records its slogan and SPK released a 7" on Industrial Records before they ever had an album. Some of those people you named never even did anything until after Throbbing Gristle ended, you have to be pretending to be retarded.
Where you would be right however, is that there used to be multiple music movements all called industrial but it was only later that the Throbbing Gristle kind became the definitive industrial. Before that, bands like Devo and Pere Ubu were called industrial. With words like industrial which have actual meanings outside of music, it's very normal for it to originally mean many different things and get applied to groups that sound nothing alike. It basically could either be industrial as it relates to electronic music, industrial as in banging metal percussion or industrial as in music shaped by the fact that it was made in an industry-driven town like Sheffield.