Ah...ok. well I'd much rather let you guide me if that's ok with you!Can you post a picture of its cere? The colored area above the beak?
Edit: Oh lol, looks like you had a run-in with the one who called everyone else a know it all while saying they know more about budgies than an entire forum of budgie breeders. The one that has a youtube channel that's all slow motion animal mating videos.
Not saying that they're wrong about your budgie, because they could be right. It does seem that they breed budgies so I do hope that they know how to sex them