I assume the mentioned feedback could be interpreted as critical. First I'd start by mentioning something they doing well OR something positive about them that

I assume the mentioned feedback could be interpreted as critical. First I'd start by mentioning something they doing well OR something positive about them that relates to their job. Ie they have good attitude or get on good with co workers etc. Then I would move on to what it was thought needed "some improvement" Id mention the "positive outcome" that would result if the feedback I was about to give was implemented. I could even tone it down ...with the words "...my opinion ..." ie My opinion , is if we ( meaning the manager ) where to do "... what ever ..." it could result in this "....more desirable outcome..." I could soften it more by saying .... we tried this at my previous job ... and it gave "...whatever the positive result is " ( Giving effective feedback is a skill. I learnt how to do in a speech training program called "Toastmasters " We had a internal Toastmasters club for the company I worked add ( Not in the US ) with about 30 members. Often the other members where >several levels< above me. Me - a very junior person at the time. So had to give feedback to Senior staff about their speech. )