My biggest thought now is about the 3rd party HR company. The details wouldn't be directly put into the handbook for reporting if they were used as a full service HR group. This means handling background checks, onboarding, offboarding, insurance, 401k, and payroll. If she was required to put in her details into a system similar to ADP, Workday, or Paylocity, those could have the direct HR contacts for reporting in their system(chat, email, phone number). Or it could be in the standard suite of onboard and harassment videos that most companies in Canada and the USA have to do after passing a certain number of employees.
I believe they are having the whole situation reviewed by a 3rd party investigator and not their current HR provider. If it's found that reports of sexual harassment were brought to the 3rd party HR and ignored or not properly investigated, LMG and the Canadian government would sue and fine them out of business.
I do expect this to take time. They have to be reviewing every email she sent, group chats, and PMs between colleagues, and any available text messages or recordings. Then using the dates and times to check for any security camera footage to valid events and timelines. The process is not a fast one.
It's important that Linus opened the door for people to be let go to the public. If there is a person doing this, then being protected and supported by a supervisor or manager, it would required both of them to be fired.