No, I wouldn't say that at all. Beginners lack general work capacity. Beginners lack technique. Beginners lack the ability to work intensely enough to require much recovery. Does squatting 135 do the same damage to the body as squatting 405? Of course not. You're not going to overtrain in a period of a few weeks, especially when you're not capable of stressing the body very hard.
And I hope I don't have to explain why machines are not any safer for a beginner.
Personally I think 135 will do the same amount of damage 405 would do considering the youth of the muscle. And why wouldn't machines be safer for beginners..lol They control the movement and have directons on the side for god sakes. I don't think its a question of over training the body I think its a question of setting a new person up with solidadvice thats safe and measurable. That he can use longer than a few weeks.. you know maybe a little routine just incase he wants to work out longer thank 3 weeks. but i dunno