Hello. Yes the wisdom tooth has to be removed. The reason is, as you can see in the xray here, it is putting pressure on its adjacent tooth and this will cause further issues in the future. If possible, i suggest get both lower wisdom teeth removed. (Both side 3rd molars of mandible) The GIC treatment is fine for the 2nd molar there as the caries is not that deep. So you are good with that.
Next Steps
Get both wisdom teeth of lower jaw extracted.