"Are you sure there are 2 angels with "the three men" in chapter 18?"
Yes it's perfectly clear to anyone who reads what is written without an agenda.
"In Chapter 18 the three are addressed as Lord and in chapter 19 the two angels are addressed as Lords."
Abraham is primarily addressing Yehowah as you would expect. Nothing to do with addressing all 3 as singular.
More made up Christian shoehorning.
"Some say it does give validation. It can be interpreted as such."
There is absolutely no reason to equate this event or other appearances of Yehowah in the OT with the Trinity doctrine or Jesus as a pre-existing Yehowah.
Initially bits of OT were plucked out to support Jesus as the Messiah or as in the case of John, an attempt to emphasise the divinity of Jesus against those who did not have that view. Only much later did the backroom boys come up with the idea of inserting Jesus into the Triune Creator belief and inventing the Trinity doctrine.
It's pure Christian manipulation to support their one upmanship "Our founder is not just bigger than your founder ... he's God."
One of the two most heinous claims foisted on the World by the "Christianity" that came out victorious from all the different streams left after Jesus' departure.
Thank goodness bits and pieces of authentic practice also managed to survive here and there.
