[jeejay1]

You are correct, title is wrong. Blame this communicator. It feels that the person that wrote the text lacks understanding of chemistry or oversimplified too much. More appropriate term for removal of water around an ion is “desolvation”.

[wavemode]

No, dehydration is the common term when it's specifically water that's being removed.

https://en.wikipedia.org/wiki/Dehydration_reaction

[jeejay1]

You are referencing to another thing. Desolvation and dehydration are not the same thing. Please google the difference between them. The title describes desolvation