Except that venn diagram is a straw wo/man.
Transgender ideology does not believe sex is nonphysical. And it doesn't believe it is chromosomally changeable. It believes that some physical aspects of sex are changeable. It believes that the interplay between sex and identity are complex, nuanced aspects of human development.
Transgender ideology does not believe gender is innate, it believes gender identity is immutable and not chosen, and develops as a result of genetic, biological, social and environmental factors.
And no matter how many overlaps in that diagram, you will never see trans people standing shoulder to shoulder with the 'dodgy', fascist, racist, fundamentalist, antisemitic, homophobic alt-right. Unlike radical feminists and transphobes.
And transgender ideology is not an ideology. Gender dysphoria is a diagnosable and treatable medical condition.