I don't think he was saying it was, to be fair - I took it to be a reference to the public conversation about the meaning of Colston memorials across the city that preceded that statue incident.
Correct. The fact that there was a statue there was of no import to anyone. No-one took any notice of the statue. Schools did not teach who Edward Colston was. Most people walking past just thought "oh a statue". It was the act of removing and vandalising it that started a conversation about who he was and why his statue was there. It started discussion about Empire and the slave trade and how profits from that were invested in Bristol, London etc and why Bristol refers to him so much.
His statue is now in a museum and we have learned much about his philanthropy off the back of slave trade profits. People wanted the statue removed from 1920 (25 years after it was erected) up until the present day. It is the trigger for debate as to whether he was "good or evil".
Statues can be useful and interesting. They are not history, but they help us connect with our history and understand where our traditions, buildings, schools, wealth etc came from.