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Here is, for instance, an EO person (@BrotherAugusti2) using this quote to make the point above. Although, from his question of “Where do you see the name of Severus in the quote I posted?”, it seems he doesn't have familiarity with the material and merely got it from an out-of-context quote-mine. He hasn't read the full quote and thus didn't realise St. Severus is mentioned there as a patriarch. 

https://twitter.com/scriptoriump/status/1961653418226774275
Homily 23: Homily 23 doesn't teach “in two natures after the union” as your own citations even lack that; moreover, two natures, created and uncreated, coming to be united under a single hypostasis is not a proof of anything. Per your own prior admissions that would be under a single individual substance (Latin “substantia” as equivalent of the Greek “hypostasis” and not Leo’s “persona”).