All of these relationships are accounting identities - true at every moment in time apart from data inconsistencies captured by a statistical discrepancy.
The direct effects of our action may be limited, given the size of our investment portfolio, which is 19 billion euros, and given the composition, which is mostly government bonds. But we hope that others will follow, and collectively, the impact will be larger. And apart from the absolute number, we as central banks exert influence by leading by example.