Obviously it was bad advice.
"Victoria Nuland on Russia-NATO relations, peace negotiations with Ukraine, and the U.S. elections"
https://www.youtube.com/watch?v=HiS2dg_atfc&t=3192s&ab_chann...
Without articulating what this advice supposedly was, or why it was bad (if it even was).
More to the point: if you think anyone has time to fish through 72 minutes of some interview about anything political on a summer weekend to sift out whatever insinuation it is that you're attempting to posit here -- then your worldview is quite dark and austere, indeed.
In retrospect, the attempt to win the war instead of negotiating was a catastrophic mistake that many people paid for and are paying with their lives.
https://en.wikipedia.org/wiki/Peace_negotiations_in_the_Russ...
They can decide for themselves whether to bend over and let Putin have his merry way with them is such a fine idea as you seem to think is, or not
Boris didn't make them do anything. That's just a myth, which presumes they are hapless fools with no agency.