Can instant dental implant require an extraction?

No but...: You have to place a dental implant somewhere. You can only place it in bone if there is no tooth there. Therefore, an existing tooth has to be extracted prior to placing an implant unless the tooth is congenitally missing or previously extracted.

Not always: I am uncertain of what is really meant by instant? Dental implants can be placed immediately after a tooth is removed. Many factors will determine this such as the density of the jaw bone, the amount of jaw bone present, the proximity of vital structures (nerves and blood vessels), medical issues etc. I assume this is what "instant" means.

No...: There are times when a tooth has been missing for quite a while. As long as there is an adequate volume of bone in the area a dental implant can be placed.

Not necessarily: The photo attached to this answer is one of an implant placed the same day as the molar tooth was extracted. I am assuming that is what you mean by an instant implant. You can also have an implant placed if there is sufficient bone height and width in a toothless site that needs a tooth. Sometimes a temporary crown can be placed on the "instant" implant, but it is for esthetics only- no function!

Possibly: Depends on what you mean by an 'instant implant' this is not the typical term used. An immediate implant requires the extraction because that means n implant is placed immediately after a tooth removal at the same appointment.

Depends: You can have an implant placed when a tooth is extracted, if the bone is sufficient and the site will allow it. You can place an implant without having an extraction if the tooth is already missing.