OP's comment is only slightly misleading. Per the myth detector [1]:

".... similar comparisons, stating that 3,300 people were arrested in the UK while only 400 in Russia, have circulated on social media for years. The original source of this claim is Konstantin Kisin, a Russia-born, half-British comedian, writer, and podcast co-host. His interview, where he makes this comparison [at 26:26], was recorded in 2019, based on data from 2016-2017.

For years, social media users have relied on Kisin’s statements to compare Russia and the UK. Many refer to data from the human rights group Agora, which reported that 411 people faced prosecution in Russia in 2017 for social media activity. In the majority of cases, media users were accused of [....] what authorities consider provocative content. On the other hand, UK comparisons are often based on a 2017 article in The Times, which cited 2016 data showing that over 3,300 people were arrested or questioned under Section 127 of the Communications Act. However, the same article notes that in half of these cases, investigations were dropped before prosecution. Additionally, Section 127 is not limited to social media, and it also applies to emails and other forms of electronic communication. Moreover, the Russian figure represents prosecutions, while the UK figure represents arrests, making the comparison inappropriate for many reasons. For example, the content of the clauses differs: in the UK, they are applied to a broader range of cases, while the data from Russia reflects arrests for the activity on social media. Additionally, the analysis of cases shows the difference between the two countries in the application of the laws. In Russia, many citizens and journalists have been arrested for expressing critical opinions or posting government-opposed views on social media. It is also worth noting that in the UK, cases brought under Section 127 that result in citizens being subjected to community service or fines are often debated."

The article I've cited mainly discusses a comparison by Guri Sultanishvili which is harder to justify, but Konstantin Kisin's comments have been more widely referenced in the public debate.

[1] https://mythdetector.com/en/free-expression-on-the-internet/