Absolutely! It's dust on the sensor. 100% sure of that.Do you think that the sensor is dirty, judging by the spot in the picture?
I'm going to point out the only thing in that kit designed to clean the camera sensor is the rocket blower, which I have had mixed success with. It will remove larger debris particles but it's not the same thing, at least to my way of thinking, as *cleaning* the sensor.I never had to clean a sensor before. I have had DSLRs since 2010 or so. Do you all have to do it frequently?
I am thinking which kit I should get. I saw this one from the video by Altura. It has good reviews. Would you all recommend it? https://www.amazon.com/gp/product/B0080JH3YE/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A1WFSHX6J483SX