[ealgeone]

From the website you cite.

5. F.F. Bruce prefers "thirteen" here, which implies the omission of Hebrews. He states that "the three best" copies of the letter "reckon Paul's epistles as thirteen (written xiii), but the rest reckon them as fourteen (written xiiii)." (Canon of Scripture, p. 234.) But it is not at all probable that Hebrews would have been deliberately omitted from the list by a Roman bishop in the year 405, and the variation between xiiii and xiii is easily explained by scribal error.

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Now, the exact quote from the book.

The omission of Hebrews from the New Testament is surprising. The manuscripts, in fact are divergent in their testimony: the three best ones reckon Paul's epistles are thirteen (written XIII), but the rest reckon them as fourteen (written XIIII).

[ConservativeMind]

“written XIIII”

Uh, that should be “XIV”

[af_vet_1981]

The books are not named in the letter. A modern Protestant scholar selected a probable scribal error to choose "xiii" instead of the more prevalent "xiiii" books attributed to the apostle Paul in the letter and in Catholic tradition. He wrote a book that contains an implication it was Hebrews, without textual evidence.