You could briefly reference the recent Supreme Court judgement establishing that the word "woman" means in the biological sense, maybe citing a few lines from it that demonstrate the sheer illogicality of any other interpretation, as a prelude to your section that justifies your adopting this perspective so that you're able to provide meaningful and accurate information to your audience.
If you want to acknowledge the alternative perspective in their blurb, perhaps include a line to the effect that you welcome other contributors' thoughts, before and/or after your own, on how their areas of expertise relate to this alternative, wider definition. Of course, this may itself risk exposing this wider definition as nonsensical and potentially offensive/counter-productive. If so, regrettably, it's tempting to say - so much the better.
Edited to add: if you're genuinely not well-versed in all this, though, it's probably fair to add that the above approach could open you to condemnation, on a spectrum from angry mutters at one end right through to attempts to de-platform you or worse at the other. Astonishing, I know. The response will likely depend on whether it is, indeed, a disclaimer, or a deep-seated belief that it's unethical to name women without including self-identifying males. I'd wager the latter is more likely, regrettably. Again, astonishing, I know.
One other comment. If you want to avoid any risk of confrontation, simply referring to "women" without any further qualification of your meaning should do the job. If the blurb realls is just a disclaimer of sorts, you should be fine! But if it isn't, and you're unlucky in your audience, I could see some scope for you being challenged should you not explicitly address the needs of transwomen, or incidentally phrase something in a way that doesn't align with the True Faith that Transwomen ARE women...
I'm so sorry that it's become this difficult to talk about women's issues. Another thread right now asks why transwomen are in any way relevant to us. This is why. We didn't ask for this confusion and volatility to be introduced into society's attempts to address women's needs.