You can't simply search for "BLM Protest". The 2020 protests are not the first BLM protests, these are just the first BLM protests that are getting global attention.
On the first row of images that appear for me, when following the sourced article, they are from the years:
2015, 2016, 2015, 2016, 2017, 2020 (everyone in this picture has masks)