That was a bold statement without any actual evidence to support your claim.
Of course more are now being diagnosed with autism, for a multitude of reasons. For a start, as you say, the diagnoses were merged and ASD now encompasses what used to be autism, Asperger Syndrome and PDD-NOS. That doesn’t mean the criteria are less strict, just different.
In order to be diagnosed one must still have “persistent difficulties with social communication and social interaction” and “restricted and repetitive patterns of behaviours, activities or interests” which “limit and impair everyday functioning”. (DSM-5)
And “persistent deficits in the ability to initiate and to sustain reciprocal social interaction and social communication, and by a range of restricted, repetitive, and inflexible patterns of behaviour, interests or activities that are clearly atypical or excessive for the individual’s age and sociocultural context” that “result in significant impairment in personal, family, social, educational, occupational or other important areas of functioning.” (ICD-11)
The diagnostic criteria for autism and social anxiety disorder are different. One may have both, but your example of social anxiety doesn’t work as no one would be diagnosed with autism with ‘only’ social anxiety.
Prior to the merge, someone said to have ‘high functioning’ autism still had autism, so I don’t understand your point about that.
If you believe certain HCPs are acting unprofessionally you should report them.