Yes, was just about to recommend that myself. Link to the video in question: https://youtu.be/j_QfX0SYCE8

If I remember it correctly, though, dehumidifiers can be useful for comfort in very specific climates where ambient humidity is high, but temperatures are mild enough to not require much actual heating or cooling. I think dehumidifiers are relatively common in many areas of the UK for that reason.

If OP is from the UK, it might be a sensible recommendation for their specific climate, just not in many places elsewhere. In the US, at least, the only place you'd find anything like that climate might be some parts of the Pacific Northwest.

The original underlying issue was several weeks of comfortable outdoor temperatures with 90%+ humidity. That meant the central air didn't need to run at all and the indoor humidity crept up over 70%.