actually many formulations are designed specifically to increase how many viable bacteria make it to your gut intact, but even formulations that aren't buffered or micro-encapsulated or pre-stressed have over a 50% transit survival rate. this is why we can get things like food poisoning or e-coli. The stomach isn't an efficient sterilizer, that is a pretty old misconception.
Lactobacillus acidophilus the most common probiotic and the one in yogurt has an average survival of 75.4% +/- 18.3%
if i read the linked article correctly, specific bacteria and formulations are indeed helpful and proven for specific conditions, and general formulations are also generally beneficial, but that many of the miracle curative health claims by the industry are overblown and she uses the term "ahead" of the research, meaning unsubstantiated.
That sounds about right to me. Beneficial yes, a cure all or miracle cure, no. Reasonable stuff.
Her analysis was pretty level headed and right in the middle of the road, she didn't claim they didn't work or didn't have benefits, she didn't claim they had miracle cure properties, she was practical and spot on in claiming that they do only what they have been proven to do, not less, not more.