This is the highest level since the week leading up to December 4th. The numbers include purchases up to and including Wednesday as it takes about two days to complete.
At its most recent interest rate meeting, the ECB decided to significantly increase the speed of its PEPP purchases in the second quarter. In doing so, it is resisting the recent rise in government bond yields in the euro countries. Because she wants to prevent higher financing costs for companies, states and households in the middle of the pandemic. Because this would come at an inopportune time because of the sluggish economy in the euro area.