Actually, that is not true..
Apart from what 8Hannah8 has mentioned (scores went well below 473 several times), someone can correct me, but the way I believe it will work is that even if you would get an ITA today, your spouse will need to be added to your application as soon as you are married...
So suppose you get it today, submit it in 3 or 4 days even, on the 23rd of November, you need to resend your updated information with the marriage certificate.... and I believe it will be recalculated with all the spousal details..
Otherwise so many engaged/ just about to get married people will send their eAPRs and then get married 10 days later, without it affecting their eligibility... so I think as soon as you update with your marriage, they would mostly re-assess the entire file with spouse...