Reb doniel sorry Gevinat Akum is not Tablet K’s main issue.Tablet K was started by rabbi safra who died in 2009 it is assumed that his family took over the business.
A good example of what to expect from tablet K: A bagel store in manhattan that sells fresh cut boars head and other non kosher items has tablet k supervision on their baked goods and bagels even though they are all processed by non jewish workers near the trief meats at the same counters.
I once visited a non-jewish supermarket that had a bakery counter claiming tablet k supervision (they baked fresh on premise) this counter was shared with fresh seafood and other products I asked the workers how often supervision came to check and they could not even give a straight
answer.
Additionally, they are a mom and pop company certifying all types of fresh and processed products manufactured under non -jewish auspices even a reliable Hashgocha certifying jewish owned companies would not be able to do a proper job with such a skeletal staff to oversee everything.
Re triangle K Rabbi Ralbag is a tremendous talmid chachom and actually got rid of many heterim that triangle K was using. There are still some leniencies that the triangle K uses that not everyone agrees with.