Checked these against a second tracker (Farside's daily spot ETF table, pulled a few minutes ago). It lines up: Monday +$526.7M, Tuesday +$23.2M, Wednesday +$524.8M, so about $1.07B over the three sessions. IBIT +$235.0M and FBTC +$212.7M on Wednesday match too.
One detail the headline hides: Monday wasn't broad buying. IBIT alone took $665.2M while FBTC lost $83.6M and GBTC lost $54.9M. Wednesday was the broader day, with even GBTC taking in $32.6M.
https://farside.co.uk/btc/
