I need help on the private caveat issue.

Last month, I asked my tenant to move out since I plan to sell the house.
The problem is that, the tenant had renovated my house without my consent (he initially planned to buy my house).
Now he threatens me to lodge a private caveat on the property to stop any selling procedures until I pay the renovation cost.
I don't have any tenancy agreement with him, however, I did text him before the renovation that I won't bear the renovation cost (he agreed).

In case he applies for private caveat, can I remove it by simply filling the 19H form?
Is this thing is eligible for private caveat claim?
I need to sell the house fast, if possible, I hope I'm not going to settle this matter in court.

Yea exactly. worst case of no agreement is tenant can stay forever and you might have to compensate him to leave.
he can sue you in court to get compensation to leave.

Why. this case = squatters. he is living at the house. nobody put a charge on it legally. so you need to prove he paying you monthly.
you will surely get income tax enquiry after this for failing to declare taxable income.
which you will be saman for 10 times the amount.