It shows that transwomen are significantly statistically more likely to commit offences for sex crimes than men (if the transwomen are in the men category too it won't matter either way for the stats skew because of the difference in volumes between men and transwomen).
I don't think you can properly make that inference from the prison data in those charts. I do find this kind of reasoning hard myself, but the problem is that prisoners are not representative of the population at large, and prisons are not like the outside world either.
Imprisoned sex offenders only make up a small subset of all sex offenders, and there are reasons why sex offenders in prison are more likely to claim a trans identity (often dropped again on leaving prison) which they would not claim outside of prison, and which men who were imprisoned for other offences would be less likely to try to claim. Most of these reasons are not to do with an inner sense of gender identity. I don't think the statistics even include transwomen with GRCs (who only make up a tiny number of these prisoners anyway)
For example, the opportunities for sex offending in prison go up very sharply if a man can get into a women's prison by claiming a trans identity. So that's a potentially strong motive for sex offenders who are in prison to do so. In the outside world sex offenders have plenty of other opportunities without claiming a trans identity.
So I don't think you can reason from those prison charts either that sex offenders in general are more likely to be transwomen than other offenders, nor that transwomen are more likely to be sex offenders than other men
Oh, and based on the raw numbers in the charts, if all these men are allowed into women's prisons they nearly double the population of sex offenders in women's prisons (103 male sex offenders who identify as women to 93 women sex offenders) So not a teeny tiny minority at all, not to the guards and the women prisoners who would have to put up with them.
I'm willing to be corrected by people who know more and can do this stuff properly!