The key phrase is "at this time"
AMD doesn't quite have all the pieces they need yet, but they are closer then ever.
I'm thinking its going to be 2021 or 2022 before we see the chip they really want to build.
I think they are waiting on two things.
1. shrink the I/O die a little, some of the stuff on the I/O doesn't shrink well, but by going to 7nm+ on it they can probably shrink the die 20-25% And by the time they do that 7nm+ should have been in mass production for 2+ years so its costs should have dropped a bit. Also the CPU and GPU might be on 5nm by that point since risk production of 5nm starts this year at TSMC.
That's enough room for a beafed up (say AVX-512 support, and just plain wider) 8/16 processor, and a on die GPU that performs somewhere between a RX580 and Vega 56
2. HBM3. HBM3 is supposed to be cheaper, and have higher densities yet again, this should mean 8 gigabyte 4 high stacks, and the possibility of 2 HBM chips on the package with a somewhat shurnken I/O die, so no need for the GPU to go to the DDR5, while still having way more then enough space and bandwidth for any 1080p gaming.
AMD would then own a huge, huge chunk of the market.