It still sends shivers down mine too. I have a friend who had CPS called on her from someone completely across the country because the woman who called didn't like my friend's outspoken internet advice on child rearing. There was a complete investigation into my friend including interviews of their youngest children. All on the anonymous tip from someone who never had seen her or her children EVER.
It is wise of you to stay vague. It keeps family relationships from getting strained at times (we had some family blowups before my parents learned this when I was young) and just keeps everyone out of your business.
I'm thankful everyday that in my case, all we had was that little whisper of warning. I'm also forever grateful to my parents for having the courage to keep us home. It took courage back then. I suspect it's going to take courage again since every year there are attempts to re-regulate homeschoolers, make vaccines mandatory, and step in on a host of other parental rights. Whether you choose these paths or not, a person should be concerned when other people aren't allowed to make those choices for their children.
May you stay safe in the decisions you lovingly and rightfully make for your kids.