I always take it with a pinch of salt.
I had huge imposter syndrome when I applied for PIP. I'd been in denial all my life about my developmental disability, and always tried to push through until I had a series of mental breakdowns. I always thought nobody would believe me because they've always seen me hide away all of my struggles and only the closest people to me know how profoundly impacted I am.
It made me feel like I didn't deserve it.
I provided all evidence and was honest at my assessment, and was awarded PIP. It was really validating that actually my struggles are persistent and I'd gone through a horrible system and come out of the other side with an award.
That said, I unfortunately also know one person who manufactures evidence. Goes to the doctor, says they can't leave the house, prescriptions aren't working, they need something else, they make appointments and cancel the appointments due to agoraphobia, they turn the tears on to all professionals. They know all the terminology, and speak like they've lived the experience they're describing.
Then they go out to work for their cash in hand job, go on holidays, make spontaneous trips out, can manage their own daily living tasks just fine, admonish those of us who actually can't manage our daily living tasks alone for our homes getting scruffy or lacking hygeine.
I have reported this person multiple times but they've got the "medical evidence" to back up their claim and it never gets anywhere. I just look like a vexatious complainant.
They're clever and always ask one of their relatives if they'd like to come along for a trip somewhere so they're never seen out of the house alone.
So I do think the fraud figures are actually higher than the DWP are reporting because of how easy it is to manufacture that evidence if you're clever enough.
I like to hope that the majority of claimants are honest. I'm also aware that many people are chancers.