I never said TPL, et al don't have access to insider info, thus being subject to insider trading scrutiny. I simply stated that they are not considered insiders subject to filing SEC forms 3,4 and 5.
I'll say it again and maybe it will sink in this time - there is a difference between having access to insider information, and being required to file SEC forms 3,4, and 5 due to the fact that you are an insider as defined for those particular forms.