What the article actually says: "These colonial subjects remain marginal in popular histories of the war. They also go largely uncommemorated by the hallowed rituals of Remembrance Day."

Largely, not entirely.

And this isn't a question of blunt fact which can be rebutted by pointing at the presence of the various Commonwealth High Commissioners during the ceremony itself, but a question of meaning and salience.

What they mean is things like this exchange which I immediately thought of: https://twitter.com/AGlasgowGirl/status/897719075182456833 (followed later by https://twitter.com/bbcstories/status/1061199619412189184 )

There definitely is a faction of people who tie remembrance to militarism to ethnic whiteness, and as part of that they will whitewash the role of non-white people in the wars.