They might not mean "easy" in the same way you mean. I sometimes find myself saying "easy" when what I mean is something more like "approachable" or "without many ambiguous roadblocks". I very much believe it is "easy" in that way to learn new programming languages. It is still hard work, requiring lots of reading and trial and error and plenty of failure, but it doesn't have that same experience of complete stuckness as the first time learning to program.

But I wouldn't say it is "easy" after learning one language. It definitely takes two or three, with step-changes each time you learn a language in a different paradigm than you have before.