WIBTAH if I sent a family group chat about not kissing my daughter's mouth but really it's meant for a specific person

My issues started with this particular family member (uncle, male 60 something, in family by marriage and gay) a couple years ago when he wouldn't stop feeding my dog, even after numerous times of asking him politely to stop. My dog can get a sensitive stomach when he doesn't have his regular food. Not only that, he would feed him whatever he was eating at the time, ham sandwich, cookies you name it. Recently he's also been trying to feed my toddler whatever he has on his plate which was chips(fries), and during most recent gathering I've had to tell him to stop again.

Onto my issue... So we all went bowling last weekend as a big family for my nephews 16th birthday and all was good. My toddler is a little clingy when it comes to big family gatherings so I was up and down a lot with her. At the end we were all saying our goodbyes and my daughter was saying bye to everyone and this uncle comes to say bye to her and my daughter puckers her lips to kiss him (shes only 18 months old) and he ends up kissing my daughter on the mouth, it was only the once but I felt uncomfortable and thought it was super inappropriate.

In my eyes a kiss on the mouth is a cute thing kids share with mum and dad, otherwise with anyone else I would class it as super creepy and inappropriate.

We have another big family gathering coming up and I'm tempted to send this to the family chat...

"Hey everyone i hope you're all doing well! Just a quick one, last family gathering as we were all leaving i noticed a family member kissing Aurora on the mouth. I don't think it matters too much about giving her kisses on the face now in terms of risk of RSV as she has a better immune system, but kissing her on the mouth I don't think is appropriate, please can we not do that again. I thought I'd put on here to save that person some embarrassment and raise the point to everyone else. Thank you! X "

WIBTAH if I sent this message to the family group chat? Any advice would be appreciated as this is my marital family not my blood family I'm dealing with.