It is likely not a measurement error. In fact, this is an eternal debate on the performance of games, since they are usually designed to have the maximum amount of single-core performance. According to this article from Intel article from Intel the Hyperthreading is:
Hyper-Threading Technology from Intel allows one physical processor
package to be perceived as two separate logical processors within the
operating system. Processor resources enabled for Hyper-Threading
Technology duplicate, tag, or share the majority of resources. Sharing
resources allows a more efficient use of the processor for a
significant performance increase, at less than 5% die size and power
consumption increase compared to a single processor package. However,
Hyper-Threading Technology cannot have performance expectations
equivalent to that of multiprocessing where all the processor
resources are replicated.
In the table that you have shown, Cinebench tests one single core of the processor. In short, HT (HyperThreading) enables two virtual cores for one physical core (the one that will be evaluated in the test). If the test is based on launching a single process that does not need to be divided, sharing resources between two cores degrades the test result, since the balance that occurs when it's active doesn't happen when it's disabled (Windows and Cinebench only see a single processor).
If we add another test from Tom's Hardware to compare it with the table you have shown (Cinebench R11.5):
The results on single-thread performance are not so different from the ones that you have shown in your page. It is important to note that the two logical processors that have separate execution states share resources such as the system bus or cache so they can not always parallelize the tasks, and it can happens sometimes thread stalling mentioned in this article that means that in the single-thread stress test, the resource sharing could tend to enqueuing some threads delivering a slightly worse performance result.
You can also see here how different scenarios in different games in the article of overclock.net were the results claims that in some cases the performance is hurt. I do not believe that this has to be taken as "disable HT improves the single-thread performance" but as "the game is optimized for a maximum of 4-cores" or "is not taking advantage of the HT". The first assumption can be validated reading some articles like this, which shows how the single-core performance of an i3 improves the performance if the HT is enabled comparing with i7 that it doesn't.
To sum up, we have seen that there are small cases that disabling HyperThreading has minimal improvements over the single thread performance, but the overall cost-benefit ratio it isn't enough to claim disabling HyperThreading. As far as the OS and the software it is designed to HT architecture, it is not worth to disable it.