At 85, it could be dementia. My mother suffered alzheimers and had some ‘creative’ stories.
Assume that the man was ordained a priest at 24 (in about 1951) and that he bacame the diocesan exorcist in his diocese the day he was ordained. That alone is verrrry unlikely since the Church takes exorcism verrry seriously and does not allow just any priest to perform them. 70,000 exorcisms in 61 years. That would be about 1150 exorcisms per year. Each year has 365 or 366 days. The priest would have had to perform about 3 exorcisms each and every day for 61 years. Typically an exorcist is serving only one diocese. Frankly I doubt that there have been 70,000 exorcisms in the entire world by any and all Catholic priests since 1900, never mind by just one priest since about 1951. Are we sure that this story does not come from the National Enquirer???