Stroke play is harder to win. You have to beat the entire field. Match play you only have to beat 6/7 guys.
Stroke play over 72 holes also decreases the effects of luck or variance, I might have a great day and beat a better player on any given day but the chances of me doing it over 4 rounds are less likely.
I didn’t read the initial guidance (thought it might be a spoiler!) and just looked at it from a mathy perspective. If I am playing others with very comparable skill levels and have a 50% chance of winning each match, 7 rounds of match play (0.5 ^ 7) is equivalent to 1/128 so I called it equal chances for same-sized field. So a smaller field for match play would tilt odds in that side’s favor.