Pages 147-149 make it very clear that Space Wolf units have been sent to watch over all the Primarchs, not just Sanguinius, regardless of their former behaviour.
It's further stated specifically that this is in response to Magnus' actions alone, nothing to do with Horus turning traitor, and nothing to do with suspicions of a flaw in the Blood Angel geneseed.
(Finally, it's stated specifically that this is on the direct orders of Malcador... I only mention this as it puts yet another nail in the The Outcast Dead timeline, as if more nails were needed... it is literally 100% inconceivable that Malcador could directly order Space Wolf units to watch over all the Primarchs without also mentioning to them "by the way, eight of them have already openly turned traitor and one of the loyalists is dead, just thought you might want to know that". Yet again, we see that TOD was simply wrong).



nagash66
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