What was the explanation for the TGs use f other than the TL...

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446eb9c2b1f1464ad68bc51fa394127db2927cec4de9730597dd259da39a56d5...
What was the explanation for the TGs use f other than the TLS layer? Did somebody look into it? Was it historical artifact from the early days that is not addressed yet, or something else, besides what the text alleges?
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