Sounds reasonable.
Old wive’s tales have to start SOMEWHERE!
1 Finally, my brethren, rejoice in the Lord. For me to write the same things to you is not tedious, but for you it is safe.
2 Beware of dogs, beware of evil workers, beware of the mutilation! 3 For we are the circumcision, who worship God in the Spirit, rejoice in Christ Jesus, and have no confidence in the flesh, 4 though I also might have confidence in the flesh. If anyone else thinks he may have confidence in the flesh, I more so: 5 circumcised the eighth day, of the stock of Israel, of the tribe of Benjamin, a Hebrew of the Hebrews; concerning the law, a Pharisee; 6 concerning zeal, persecuting the church; concerning the righteousness which is in the law, blameless.
7 But what things were gain to me, these I have counted loss for Christ. 8 Yet indeed I also count all things loss for the excellence of the knowledge of Christ Jesus my Lord, for whom I have suffered the loss of all things, and count them as rubbish, that I may gain Christ 9 and be found in Him, not having my own righteousness, which is from the law, but that which is through faith in Christ, the righteousness which is from God byfaith; 10 that I may know Him and the power of His resurrection, and the fellowship of His sufferings, being conformed to His death, 11 if, by any means, I may attain to the resurrection from the dead.
I think it was not intended to be unscriptural. I think they intended it for good.