That 95% statistic is from a book published in the 1950s and was simply picked out of thin air.

The latest stats are about 60% of people who choose to lose weight and persist lose close to the amount they wish to. Anecdote: Lost 30 pounds in 3 months, from nearly obese to normal weight, kept it off 20 years . No I didn't do keto (tried it at one point to lose another 10 pounds but it didn't do anything, and yes, I followed it precisely, to the letter).

Be careful when quoting unscientific information.