It most certainly is enough to make a major lifestyle improvement when someone is living paycheck to paycheck. That could be the difference between just barely scraping by to being able to comfortably buy necessities and maybe even grow a savings.
This is not what the recent universal basic income study showed.
If you're talking about the OpenResearch study that Sam Altman is funding then yes it did [1]. Granted this study was a little bit more money but the results imply that any amount of extra money helps people living paycheck to paycheck in terms of financial flexibility and safety.
[1] https://www.openresearchlab.org/findings/nber-working-paper-...