What this practically means is no one can go to communion, ever. Because everyone has these sins in their head all the time. Martin Luther tried to deal with this by spending hours a day in the confessional, but he still couldn’t do it.
Confession was part of John the Baptist’s baptism, and baptism continued to be important in Christianity, but Jesus never insisted on confession before he did anything for anybody. The people he encountered, to the extent they had sin to confess, seemed to be aware of it and he didn’t go into it.
Much more important it seems to me is what Jesus was willing to do and was willing to give.