No.
Then you made an error in your asset allocation % ... you had money you might "need" in the short term too heavily invested in equities.
Or - if you really "need" the money, you withdraw it from your bond allocation instead of the equitie. (This will bring your AA closer to the proportion you intended anyway. The absolute wrong thing to do is sell the equity side and push your AA even further out of balance.)
Long term investment in any market index fund is implicit belief that over the long term (decades) the economy that market represents will grow and create value and wealth.
There's no timing involved in taking the "things will get bigger over my lifetime" position.
Market timing is understood to mean making moves to extract profit from short term variations - i.e. the "noise" in the generally upward long term trend.
If you're going to equate "buy and hold for 30 years" with "timing" then you're using a fundamentally different definition of the word than literally everyone else. Which is odd, unless you're trying to make some rhetorical point by deliberately misusing the term.
What if the market NEVER corrected to your planned 2300 buy-in point? When do you quit timing and buy in anyway?
What if it goes to 3500, then glides down to 2500, then back up to 3500 by the year 2030? You just going to sit and wait for it to go below 2300?
From March of 1995 to March of 1996 the S&P500 went from the 480s to 640s, a pretty big gain. +30%!! What if you sat it out and waited to buy on a dip to the mid 500s?
But it goes up and up ... and then a correction happens and it's down to the 800s in 2002. But still not to your 550 threshold. So you sit.
7 years later, its March of 2009 and it's briefly down to the upper 600s. But nope, it doesn't hit 550. So you sit.
Now it's over 2000. Still going to sit on the sidelines?
The problem is that waiting to "buy on the dip" carries very real risk that a sufficiently low dip may NEVER come.