Yes. It is an EF lens and according to Canon, the D70 accepts EF lens mount.

Canon EF 75-300mm f/4-5.6 III USM Lens
Excellent condition. Clean glass. Includes front and rear caps, lens hood and UV filter. Fits full frame bodies.
$75 + shipping and PayPal fees
USPS Priority to US

And don't forget the different operating systems. If you're used to PC, switching to Mac is definitely a learning curve and vice-versa.

I have an HP Spectre 360 convertible with touchscreen and pen. I can fold over into tablet mode and use pen in Photoshop and Lightroom which is fantastic! 8th generation Intel Core i7 processor, 16GB Ram, 512GB SS drive. Windows 10 with 1 TB OneDrive storage and Synology NAS storage for backup redundancies. Setup works great for me!! I think I paid around $1200 for laptop.

I really like the Topaz products, especially DeNoise AI and Sharpen AI. I think they're on sale right now.

I shoot mostly wildlife and almost exclusively in manual mode. I don't like auto ISO because it can push beyond acceptable levels. I like to be in control, not the camera. If the lighting doesn't work, I don't take the shot. I figure why waste my time if I won't be happy fixing in post processing?

If you're used to a PC, you will definitely have a learning curve changing to Mac. I am pretty good with computers and every time my wife asks me about something about her Apple products, I have to do an internet search. Macs and PCs are kinda like politics. Apple folks are very loyal - for good reason. For me, I would never switch because of the learning and I have an awesome HP Spectre 360 laptop that is better than an iMac Pro and cost quite a bit less. But that's what works for me. Always a tough decision. Good luck!