I'm not sure I would agree that they are an oppressed group though.
They are a group who have the wholehearted support of most political parties, the civil service, the NHS, the Police etc. They have powerful lobby groups fighting for their interests. They have whole months of the year celebrating them.
Not only do they have the same rights everyone else has, they also have rights no one else has, such as the right to access single sex spaces for the opposite sex (regardless of whether those members of the opposite sex consent), the right to force other people to use non standard pronouns, and essentially the right not to have their feelings hurt. Expressing critical views about trans people or gender ideology is almost always condemned as transphobic.
Meanwhile, women have lost the right to have a word for themselves, any single sex spaces, and the right to identify themselves in a way that doesn't include male people. We have been redefined as people who perform feminine stereotypes, rather than female people, purely so that this group of male people can be included.
They are allowed to police the language we use to talk about them, but they are free to call us cis, and terfs, and bigots, without any consequences.
Society bends over backwards to accommodate them, usually to women's cost.
In what sense are they oppressed?