I really don't know anything about forging, but I do have some afterthoughts..
On one hand, the Hittites had both iron and diplomatic relationship with the Egypt (truce was signed during Tut's reign), so that there certainly could have given iron blades as present to the pharaoh.
One the other hand, Egyptians had a centuries long tradition of working meteorite iron, as did other peoples in the Eastern Mediterranean.
However, this is all irrelevant, because analysis of the composition of the blade shows composition typical of meteorite iron (
https://en.wikipedia.org/wiki/Tutank...n_dagger_blade). As far as I know, such high nickel does not occur in normal iron ore and no ancient culture mined or smelted nickel. So, for me this case is closed.
Further, it is mentioned in the thread that early iron was not superior to bronze for tools. But another main advantage of iron has been missed here. Iron ore is much more common=cheaper than bronze, as it is today.
Lastly, the spread of iron working following the bronze-age collapse is discussed in the Old Testament. In Samuel, Saul complains that there are no lances an swords in Israel because the Philistines monopolize iron working. The Israelites have to go to Philistines, their enemies even to sharpen and mend their tools - plows, axes and spades are mentioned.