An article about getting enough protein without meat and doesn’t talk about essentials aminoacides is worthless. You should read about Protein Digestibility Corrected Amino Acid Score and the new Digestible Indispensable Amino Acid Score all plant proteins are not equals, and should be eaten simultaneously to avoid deficiencies to have a complete profile to bring muscle protein.
Also anabolic response is lower with plant based protein versus animal based and it should talk about B12 as deficiencies in it is a silent killer.
https://en.m.wikipedia.org/wiki/Essential_amino_acid
https://en.m.wikipedia.org/wiki/Protein_Digestibility_Correc...
https://en.m.wikipedia.org/wiki/Digestible_Indispensable_Ami...
https://dabamirror.sci-hub.cc/bbb1a373d204d4fe2c1f9a8a38356d...
http://dacemirror.sci-hub.cc/journal-article/a73bbb377b5c4cd...