The carrying device shown is an Ergo, which is known to be one of the safest… when used properly. You can see he hasn’t bothered to clip the back clip (which means that it’s not secure on him.) It’s not properly fitted on him, giving that horrible ‘baby’s going to fall’ appearance… it’s horrible!
But using him as an argument as to why people shouldn’t use them is wrong. There’s so many studies about why people should use carriers and keep their babies on them, and every carrier says not to use it while doing ‘sports’.