I'd guess their advice is sound. I have 5-6-7 sites I used for medical advice, as well as my PCP. When all the sites agree I figure it's probably best current advice.
If particularly curious, I delve into studies, at least their conclusions part.
My PCP of course is not a cardiologist. I was under the care of one for a while and decided he was not ... helpful, to me, he didn't listen. He had me on medication to slow my heart rate and I was consistently in bradycardia. He insisted I take a blood thinner without listening to my specific medical history. I guess he was tired of patients questioning him, he didn't like it.
My other cardiologist, the "electrician", was great.
I got one of these cards that does an EKG using my fingers, my PCP suggested I check every month or any time I thought I could have symptoms. Pretty neat gadget.
I have a bp cuff also, but I haven't done that in a while, the batteries died. I was pretty much always well below 130.