They didn't give any reason for preferring Standard Time over Daylight Savings Time.
>[T]here is a discrepancy between your biological clock and social clock, which researchers refer to as “social jet lag,” Dr. Roenneberg said. Permanent standard time is closer to the sun’s natural time so social jet lag is reduced, he added. “Daylight-saving time means that we virtually live in another time zone without changing the day-light cycle,” Dr. Roenneberg said. “The problem is the misalignment."
Which makes sense on its own, but it doesn't account for the variance within time zones. A Chicago resident experiences sunrise and sunset about an hour earlier than a resident of Lubbock, Texas, even though they are in the same time zone (Central). So you can't really say that Standard Time is the one-size-fits-all solution -- and indeed, the Illinois Senate just passed a bill [1] to make DST permanent in that state (although it is hamstrung by the same federal regulations that other states face after passing similar bills).
[1] https://www.illinoispolicy.org/illinois-senate-passes-bill-t...
Depending on schedule, location, and plain personal preference, any number of time schemes could be "the best" for any given person. Ultimately it doesn't matter whose on what time as long as we are standardized to reasonable large areas, and pick something that's within a few hours of most people's ideal.
Also Roenneberg is quite clearly aware of the variance of daylight within time zones and the health effect that this causes. I bet he's even written papers on this effect!
> Conclusion
> In summary, the scientific literature strongly argues against the switching between DST and Standard Time and even more so against adopting DST permanently. The latter would exaggerate all the effects described above beyond the simple extension of DST from approximately 8 months/year to 12 months/year (depending on country) since body clocks are generally even later during winter than during the long photoperiods of summer (with DST) (Kantermann et al., 2007; Hadlow et al., 2014, 2018; Hashizaki et al., 2018). Perennial DST increases SJL prevalence even more, as described above.
[…]
> Summary
> Discrepancies and misalignments between social (local) clock time, sun clock time, and body clock time can be caused by political decisions: DST is one example. There are multiple health and safety consequences of these misalignments. Our goal is that this article’s facts and reasoning will be used to make clock choices that improve human lives.
* https://www.frontiersin.org/articles/10.3389/fphys.2019.0094...
Personally, I prefer DST. During standard time in California, I have to shift my sleep cycle earlier relative to the clock time as I am unable to sleep once the sun is up which is typically before 7 am.
The point is that the [bi-]annual shifting causes health issues, not which side of the shift we stick to