The match result data for Cloud appears to be stored differently. Let me check how results are recorded in the database.
Here are Cloud's worst matchups in Duel Commander over the last 6 months (minimum 10 matches, mirrors excluded):
Worst matchups:
The two most punishing matchups for Cloud are Asmo and Aminatou, both sitting at sub-12% winrates, though the sample sizes are small (10-11 matches). Lumra stands out as the most statistically significant bad matchup with 67 matches played at 39.3%. Cloud's overall winrate sits at 53.8%, so these matchups are significant drags compared to its general performance.
Sources: Data from 55 Duel Commander tournaments (65.5% Melee, 34.5% MTGO) over the last 6 months.
https://melee.gg/Decklist/View/a1f184a0-98c6-4ebf-a631-b47e005b8666
https://melee.gg/Decklist/View/56e05868-977b-483f-a32d-b47e007d4aed
https://melee.gg/Decklist/View/72cc0d4f-432d-43b6-a101-b47b010a22b8