I have duplicated Sidney's work to use on my portfolio page for etrdesign.com(which will be looking like this page). Unfortunately, I didn't have time to properly implemented it on my site but it seems there several people looking for it so I tried to show it here. I changed the code and tried several things with no knowledge of JS. Sorry in advance if there are some problems.
PS. Website is also using Fullpage.js (Codes of fullpage.js is not on designer side. It's on Custom Codes part of Project Settings)

Div Block: Typed Wrapper 1 (Do Your Styling On Wrapper)

selector: TypedWithCursor

Blinking Cursor is default. You can close it completely with showCursor:false, or stop blinking with editing style inside <head> tag.

Div Block: Typed Wrapper 1 (Do Your Styling On Wrapper)

selector: TypedWithoutCursor

Div Block: Typed Wrapper 2 (Do Your Styling On Wrapper)

selector: TypedWithLoop3

Div Block: Typed Wrapper 2 (Do Your Styling On Wrapper)

selector: TypedWithLoopInfinity

Div Block: Typed Wrapper 1 (Do Your Styling On Wrapper)

selector: TypedWithoutLoop

You are seeing only the end of it because the typed animation starts with the load of the page. This is a one cycle. No loop. Same as the home page typed animation. If someone can tell me how to start each animation with Tab Trigger, it will be awesome.

Div Block: Typed Wrapper 1 (Do Your Styling On Wrapper)

selector: TypedSmartBackspace

This is real!

I have no idea but smartBackspace is not working with Typed.js on webflow. So I did a workaround if you need it. The "real" span inside H1 heading is named as selector: TypedSmartBackspace

etr.

typed.js demos for webflow

Custom Codes

There are two parts of code you need to copy on to your project.
One goes under <HEAD> and other part goes under <BODY> tag. Copy the custom codes from the project. There is share link at the bottom. Also, you can clone this project from showcase.

<head>

You are going to insert code for "the blinking style of the cursor" here.

<body>

You are going to insert code for "typed.js and your strings" here.

Here is Webflow Share Link

etr.