Well it may be that the author of this course uses his own server to host his contents. Making it difficult for pirates to get access to the content. In other words, you will have to wait for one unhappy customer to leak the videos.
There are multiple udemy courses out there free and pirated that will teach you everything about DM, Blogging and such.
That being said 150 USD is a very good sum of money. One can start a website for 1 year with just 15 USD (domain and hosting combined), and with the rest you can advertise for 1 month getting more than 100 clicks per day.
I would suggest you to learn the hard way and learn from as many different people as you can.
Udemy is the best place to start.