1) Happens with the parents, the clinics, and us.
Only one clinic was referenced.
2) The hypothesis happens with the parents, clinics, and us.
Alright.
So your hypothesis is that masking caused speech delays?
3) Testing of the hypothesis happens when the professionals at these clinics perform tests on the children.
One clinic was referenced. No tests were performed to determine what masking did to children’s speech.
4) The conclusion is drawn by the parents, the clinics, and us based on the above.
Then the conclusion was drawn without any testing of the hypothesis.
The very field these speech professionals inhabit happens to be scientific in nature. They must use the scientific method to determine what circumstances are affecting these children.
Indeed it is. But if you read the original article your OP linked to you will they did not make any claims of certainty regarding masking and speech delays. They also observed the biggest increase in patients was in the 2 and under group (again, critical window for speech). Those are not school children.
Therapists say they are seeing children with speech delays with the use of face masks to slow the spread of COVID-19.
www.wpbf.com
She said that during this pandemic, her speech therapy clinic has seen an enormous shift in the ages of its patients. Before the pandemic, only 5% of patients were babies and toddlers, while today it's soared to 20%. Many parents call it "COVID-delayed."
"We've seen a 364% patient increase in patient referrals of babies and toddlers from pediatricians and parents," Theek said.
When asked if they are children having a difficult time speaking, Theek said they are "speech-delayed."
Babies start learning how to speak by reading lips at as young as 8-months-old. So when lips and faces are covered up by masks, therapists say for some kids, they can work around the mask and still learn to speak perfectly fine. But for others, it can cause speech delays.
"There's no research out there yet saying that this could be causing speech and language delays. But, most definitely, I'm sure it's a factor," Theek said. "It's very important that kids do see your face to learn, so they're watching your mouth."
….and article concludes with:
The biggest piece of advice, therapists say, is to give your kids your time. When parents are home and the mask is off, turn off the media and instead read to your child, play and sing with them, so they can observe speech.
Essentially, it could a factor out of many (and given they are not in school why are people wearing masks?