Turin Turambar is back! Happy to see you and take a shot at your question. Did this Poe give its sources? That would make things easier, but anyway I did some delving for the fun of it, and so far, my short answer is: no.
my longer answer appears below the following line for some reason
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Going way back to
Tolkien's
Tale of Turambar (
Turambar And The Foalóke), when Úrin (
Húrin ) went to battle,
Túrin remained behind with Mavwin (
Morwen) for he was not yet
"war-high".
Some confusion
might arise from a couple of outlines for the continuation of
The Book Of Lost Tales (see
Gilfanon's Tale: The Travail of the Noldoli) in which we find the following wording
A) "the children of Úrin (Sons of Úrin)" alone of
Men fought to the last, and none save two messengers came out of the fray -- and
B) (a later outline) the
"sons of Úrin" alone stood fast until they were slain; but Úrin was taken.
If Tolkien really meant to include Túrin here, it would seem he did not survive! But I'd say (see below) that these notes were written
after the Tale of Túrin, in which, as I quoted already, Túrin himself was too young, as
Server Room Gremlin already pointed out.
Indeed I note Christopher Tolkien's commentary here:
"But the people of Úrin are faithful, and do not survive it" [the battle], and again, Christopher states that the idea of the
"folk of Úrin" being steadfast
"already existed at this time in a tale that had been written (that of Túrin)"
Noting that Christopher Tolkien uses both "people" of Úrin and "folk" of Úrin, not "sons" or "children", as in the outlines.
Sooo, reading both Christopher Tolkien's commentary and commentary from the famed Tolkien Scholars Hammond and Scull, to my mind (so far) it appears confirmed that the story of Túrin being too young was already written
before these notes, which again, appear to describe that the "children/sons" of Úrin die, except for (earlier version) "two messengers", and (later version), the "sons" of Úrin were slain.
Unless I missed something? If so, never mind
🐾