That's an epidemiological study. Such studies prove nothing. They can be used as a starting point for a real study, but by themselves prove nothing.

These people were given a questionnaire about their diet, and then 10-20 years later given a 2nd questionnaire.

... recruited across the UK between 1993 and 2001 ... recruited 7421 men and women aged 35 to 59 who were registered with participating general practices, all of whom completed a full questionnaire on their diet, lifestyle, health characteristics, and medical history.

Subsequently, a follow-up questionnaire was sent to participants in 2010, which asked similar questions on their diet and lifestyle, and participants returned the questionnaires between 2010 and 2013.

Can you tell me how many servings of XYZ you ate over the past 10-20 years?

Nah, didn't think so.

Means nothing.

Can you point to where I claimed a diet high in saturated fat should be avoided?

No, you didn't. But vegans do. Always.