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The article says it’s specifically violence “because of their gender identity” so it’s reasonably safe to assume that yes, this is notably higher than cis people. It’s a little uncommon for a cis person to receive threats because they present as the gender they were assigned at birth.
There’s no control group because it’s a survey of trans and non-binary people, not a study.
Personally I find one in every five people of any group being threatened or attacked absurdly high, I definitely don’t envy wherever you live.
The survey question was specifically relating to physical violence, online and other forms of harassment were separate. Since a quarter of participants reported even going as far as avoiding retail stores within the past year to avoid harassment I don’t think it’s unreasonable to conclude they are less publicly visible than cis people. It’s also worth noting that more than half of survey respondents identified more closely with non-binary than trans man or trans woman; the report states that trans women had a much higher rate at 25%, 14%, and 11% of threats, attempts, and deliberate physical harm respectively. These numbers do not include sexual assault and related crimes which were also disturbingly high.
https://countingourselves.nz/2022-survey-report/