This data shows undocumented immigrants are less likely to get arrested, saying they're less likely to commit crimes is a speculative inference. If we're being consistent we would have to assume that any group with a high arrest rate must be a group that commits many crimes, which is not something the type of people who use the phrase "undocumented immigrants" are likely to accept as valid.
In general being in a country without valid papers gives one a strong incentive to avoid getting arrested.
In general being in a country without valid papers gives one a strong incentive to avoid getting arrested.