That's not correct. Photoshop, Illustrator and Lightroom are all available on the iPad.
Adobe Photoshop on the iPad is here with the features you love: layers, retouching, compositing and more. Your projects are the same on your desktop or a mountaintop.
www.adobe.com
With Adobe Illustrator on the iPad, you’ll get the same power you’ve come to expect from all of Adobe’s advanced tools. Create beautiful graphics, illustrations, logos and more.
www.adobe.com
MAKE YOUR PHOTOS AND VIDEOS STAND OUT WITH EASE Join millions of users who trust Adobe Photoshop Lightroom to create stunning photos and videos with professional results. Whether you’re a budding photographer, a seasoned pro, or just love capturing life’s moments, Lightroom’s Photo & Video...
apps.apple.com
Looks like the Apple Pencil will work with either Photoshop or Illustrator. Not sure about Lightroom.
Can't speak for how well it works though as I'm only familiar with the desktop versions of those apps.