It says online tip, but it also says that it was forwarded to another agent by the Threat Intake Examiner. Why would it be forwarded to another agent if it wasn't actually Mark Epstein? Does the Threat Intake Examiner verify the claims or does the Threat Intake Examiner send bullshit to agents? What is the purpose of the Threat Intake Examiner if it doesn't verify the legitimacy of tips? What exactly is the 'Examiner' examining?

From FBI website:

In early 2018, following the tragic shooting in Parkland, Florida, the FBI took a hard look at how it processes tips and how its Public Access Line was structured and operated during that time. “It’s up to all Americans to be vigilant, and when members of the public contact us with concerns, we must act properly and quickly,” FBI Director Christopher Wray said in a statement.

NTOC threat intake examiners review online tips and answer calls every day of the year, every minute of the day and night. Examiners are provided with the technology they need to assess each caller’s tip and the substance of each tip.

The threat examiners gather as much information as possible from the caller and then conduct research and analysis to help determine where that information should be directed and what further action should be taken.

NTOC examiners relay urgent matters or situations that require immediate action to the appropriate law enforcement or public safety partners—often staying on the line with the caller until help can be summoned.

If a tip is not related to a federal law enforcement matter, the intake examiners will help the caller get to the right resource. “We try to take that extra step, maybe even just providing them a phone number,” reported Kari, an NTOC threat intake examiner.

Every tip is documented in the center’s database. If a piece of information is deemed actionable, the examiner writes up a full report in consultation with a supervisory special agent. The agent assists examiners and answers questions, oversees work, and then relays information directly to FBI field offices for further investigation.

https://web.archive.org/web/20201221164047/https://www.fbi.gov/news/stories/inside-the-national-threat-operations-center-110719

I find it less plausible his brother would come forward after 3 years and do it via this particular means. I mean if he had solid info he could have come to the FBI or some other law enforcement and given a statement. If he feels he'd be killed for it then why submit this tip at all without any information that might lead to anything further.

Why did the Epstein birthday book only come out this year? There was a suspicion that Mark Epstein leaked the Trump-Epstein Birthday Letter to WSJ early this year. The reason being that Mark Epstein was suspected to believe that Trump killed his brother. The birthday book and other files in possession of the Democrat House Oversight committee were delivered by the Epstein Estate this year.