I don't think there is a connection between network fees and accumulation of Bitcoin so network fee shouldn't be a problem that would hold you back from investing on Bitcoin because there is no fee associated during your Bitcoin accumulation, so all you just need is to invest on your weekly target, however I have not heard were any fees would prevent someone from there persistent accumulation of Bitcoin, so possibly you can clarify me on the connection the fees has against your Bitcoin accumulation.
Usually it won't affect but there were times when ordinals paying fees and almost stalled actual Bitcoin for a month and forced them to pay like huge amount let's say 500-1000sat/vb and in that case it definitely affected people from transacting and let's say if someone is investing $50 or $100 every week they would hesitate at that moment or they have to trust the exchange by holding it there which is not recommended since exchange is prone to hacks at anytime.
So that might affected in a way but things back to normalise almost since the Q2 and there's no signs that those kind of spam attack is possible since the hype around ordinals faded away which means it can't be a problem anymore.
Unless he was talking about the withdrawal fees from the exchange which always 5x or even higher than the fee needed depends on the exchanges.
Transaction fee shouldn't be a barrier for you to keep your regular DCA ongoing because if transaction fees are high due to ordinals spam, you can just focus only on buying regularly from an exchange and leave your bitcoin in the exchange for the main time will fees gets back to normal because it will surely come back to normal, you then transfer it to our self custody wallet. During that period that your bitcoin is in the custody of a third party does not mean that you will lose your bitcoin. It is only when you use the exchange as your personal wallet i.e keeping your bitcoin for long in there that you might loose your bitoin.