It's not an officer - he merely wears a shako, which was in use in many countries around 1800-1840 AD and most notably during the Napoleonic wars. The three other guys wear tricorne hats that were in use throughout the 18th century and went out of fashion by 1790's.
Which illustrates the minor complaint I have with Civ V and now, it looks like it applies to Civ VI as well: historical inaccuracies that have perfectly historical counterparts that could have been used.
In this case, both the shako and the tricorn were obsolete BEFORE Victoria ever came on the throne AND they were never worn at the same time. Therefore, these are not really Redcoats, but a bunch of historical re-enactors getting together at a convention for a photo shoot.
Oh, and the red coat was abandoned during Victoria's reign, so it's not even particularly appropriate for this particular leader.
But those are quibbles that don't affect play of the game (and certainly won't stop me from buying and playing it!)
The bigger problem is that they still haven't fixed the Uniques As Straitjackets or Inappropriate Uniques problem.
For instance: Britain/England's Uniques seem directed towards a naval power, expand to other continents style - what if you're playing on a Pangaea Map?
TR and America doesn't like people starting wars on 'his' Continent.
What if He's on a Pangaea Map - does he end up at war with everybody?
What is he's on an Archipelago with no room for any other nation/player?
I hope I make my point: again, as in Civ V, Uniques are only applicable in certain situations, and may be completely inappropriate in the particular game you are playing, unless you go in and pre-set the starting conditions and map.
What this guarantees is that Modders will be IMMEDIATELY proposing 'different' combinations of Uniques and Leaders for each popular Civilization in the game, as has happened in Civ V (by my count, there are at least 3 different 'England' Mods, including Victoria, Henry VIII, and Churchill, and USA Mods that include Franklin Roosevelt, Lincoln, and TR - look for at least as many in Civ VI within 6 - 10 months of the game's release!)